WDFW LogoCrossing Paths With Washington’s Wildlife News Notes are about wildlife you may encounter where you live or recreate,  including our Backyard Wildlife Sanctuary program to provide habitat year-round on your own property.  
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Crossing Paths Newsletter
Writer/Editor: Madonna Luers

Contributing Wildlife Biologists:
• Russell Link
• Patricia Thompson
• Christopher Anderson
• Howard Ferguson
• Michelle Tirhi

 
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Note: If you’re interested in monthly information about Washington's wildlife and WDFW’s Backyard Wildlife Sanctuary Program, you can “e-subscribe” to our “Crossing Paths with Washington’s Wildlife” news notes at http://wdfw.wa.gov/lists/ . As an e-mail subscriber to “Crossing Paths,” you’ll receive these news updates automatically in your e-mail inbox, without linking to a download. As always, you can easily unsubscribe by following the instructions on our WDFW Mailing Lists website. We hope you find these news notes timely and useful. If you have any questions, please contact Madonna Luers at Madonna.Luers@dfw.wa.gov

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December 2016

Count birds in your backyard or community this winter for science – and fun!

Photo: A group of people with telescopes and binoculars participating in the annual Christmas Bird Count.
The birds you watch in your backyard this winter can be part of scientific data bases that count on you counting them.

The birds you watch in your backyard this winter can be part of scientific data bases that count on you counting them.

The longest running such count in the world is the 117th annual Audubon Christmas Bird Count (CBC), and you can still get in on one of Washington's 40-some official counts scheduled between Dec. 14, 2016 and Jan. 5, 2017.

The CBC provides critical data on bird population trend, and tens of thousands of participants throughout the Americas know that it's also a lot of fun.  The count has become a family tradition among generations, with veteran and novice birdwatchers armed with binoculars, bird guides, and checklists, often out before dawn and until dusk, on an annual mission to both make a difference and to experience the beauty of nature during the holiday season.

If you're just learning bird identification, joining up with others who are more knowledgeable is one of the best ways to accelerate your education. If you're a pro at distinguishing Cassin's finches from house finches or sharp-shinned hawks from Cooper's hawks, join a count to help others.

All of the official counts are within designated areas, and long-running ones have traditional spots within those areas to look for birds. But many counts also include what you might tally the day of the count at your own backyard bird feeders.

You can find counts by community and date, and learn who to contact for data compilation, at the Washington Ornithological Society website at http://wos.org/cbc/ .  More information, including lists of bird species counted in the past, is at http://www.audubon.org/content/join-christmas-bird-count.

Even easier for backyard birders is the Great Backyard Bird Count (GBBC), and the 19th annual will be conducted February 17-20, 2017.

GBBC participants count birds anywhere for as little or as long as they wish during the four-day period. They tally the highest number of birds of each species seen together at any one time. To report their counts, they fill out an online checklist at http://gbbc.birdcount.org/.

As this count progresses, anyone with Internet access can explore what is being reported from their own towns or anywhere in the United States and Canada. They can also see how this year's numbers compare with those from previous years. Participants may also send in photographs of the birds they see for the GBBC's on-line photo gallery.

Both of these bird counts are good ways to learn more about the birds you see in your backyard or neighborhood or local wildlife area. They're also a great way to add to our collective knowledge about birds.


November 2016

During this dark season, remember that too much light can be hard on wildlife

Photo: Flock of migrating birds shown at night using the moon for navigation.
During migration, birds are believed to use the moon and stars for navigation. Studies have shown that millions of birds have become disoriented by the bright lights of buildings and crash into them.

Of all the things we humans do that create problems for wildlife, did you ever think our affinity for lighting the darkness around us would be one of them?

Light pollution has long been recognized as a problem for stargazers, but research shows that too much artificial lighting affects wildlife, particularly migrating birds.

During migration, birds are believed to use the moon and stars for navigation. Studies have shown that millions of birds have become disoriented by the bright lights of buildings and crash into them.

Birds migrating at night are strongly attracted to and even trapped by sources of artificial light, particularly during periods of low cloud cover or inclement weather when stars are obstructed.  When they approach lighthouses, floodlit obstacles, ceilometers (light beams generally used at airports to determine the altitude of cloud cover), communication towers, or lighted tall buildings, they become vulnerable to collisions with the structures themselves.

But even if collision is avoided, birds are still at risk of death or injury. Once inside a beam of light, birds are reluctant to fly out of the lighted area into the dark, and often continue to flap around in the beam of light until they drop to the ground with exhaustion. Secondary threats from their concentration at lighted structures are increased vulnerability to predation and difficulty finding food once trapped in an urban environment.

Other research shows that light pollution directly affects reproduction and feeding patterns of some birds, bats, and other wildlife. Some scientists are even looking into what role light pollution plays in the recent decline of fireflies. 

To appreciate the magnitude of modern light pollution, consider that when Galileo studied the Milky Way 400 years ago, it was so bright that it cast shadows on the ground. Today most Americans no longer live in a place where they can see it with the naked eye.

Light pollution is partly the result of bad lighting design, which allows artificial light to shine outward and upward into the sky, where it's not wanted, instead of focusing it downward, where it is. So at least part of the solution is to design light fixtures that are hooded so they cast light downward instead of horizontally or upward, and to turn off unnecessary lights at night.  These measures, of course, have the added advantage of reducing energy consumption.

Large cities like New York, Chicago, and Toronto now have "Lights Out" programs that require dimming or turning off lights twice a year during bird migrations. Some municipalities realize that if some lights are unnecessary at those times, they're probably unnecessary altogether.

Here in Washington, many municipalities have ordinances restricting outdoor lighting, motivated initially by concerns about intrusive glare for humans, but a start toward light pollution control for wildlife, too.

Just this year the Washington State Department of Transportation (WSDOT) started to evaluate how light pollution from state highways and facilities can be minimized while still meeting safety standards. WSDOT is also looking at how budget savings can be achieved through different types of lighting.  

Recent unsuccessful proposals to have the Washington Department of Ecology assess the environmental, economic, and public health effects of light pollution and provide policy recommendations could be revisited in the State Legislature's next session.

At the federal level, this year's new guidelines for communication tower lights spell out how tower operators can save birds and energy without sacrificing safety. Put in place by the Federal Communications Commission (FCC) and Federal Aviation Administration (FAA), the guidelines strongly encourage tower operators to turn off or reprogram steady-burning red or white lights in favor of flashing lights, which are less harmful to birds yet still alert pilots to the towers.

As of late October, operators of more than 750 tall towers nationwide had already updated their lighting systems under the new guidelines. Making the switch saves energy, reduces operating costs, and reduces bird collisions substantially.

Like so many problems we humans collectively create for wildlife, solutions start with individual actions. So consider:

  • Turning off unneeded lights around your home
  • Investing in better designed lighting that is less likely to affect wildlife
  • Keeping blinds/shades drawn from dusk through dawn to avoid spilling interior light to the outside
  • Requesting that your place of business or school take these same steps
  • Seeking adoption of "Lights Out" programs in your community

More information about light pollution and its effects on wildlife is available from:   


October 2016

Watch out for deer on the roads this fall
If only it were this easy……

Photo: A young buck running across a busy road.
Fall is deer collision time on our roadways in Washington for a number of reasons.
Did you hear about the folks who called the Department of Transportation to request removal of the "Deer Crossing" sign on their road? They said that too many deer were being hit by cars and they no longer wanted them to cross there.

Fall is deer collision time on our roadways in Washington for a number of reasons.

Some are about deer behavior at this time of year. Deer generally move to lower elevations in the fall for easier foraging, and that's often near human development, including roads. It's also the rut or breeding season for deer, when bucks are less wary and all deer are moving around more.

Some are about our behavior at this time of year. Shorter days and the shift to daylight savings time put more drivers out on the roads during dimly lit hours when everything is harder to see.

Whatever the reason, the increased collision rate with deer in the fall was long ago documented by a Washington Department of Fish and Wildlife (WDFW) analysis of a Washington State Department of Transportation (WSDOT) database on deer and elk carcass removal on roadways across the state. Between 2000 and 2004, a total of 14,969 deer and 415 elk carcasses were collected and recorded by date and specific milepost on Washington's 7,046 miles of highways that receive 31.6 billion miles of travel each year.

The data confirmed some intuitive notions -- deer-vehicle collisions are greatest where deer populations are most dense and where traffic is greatest. Because of those factors and others, high collision sites are clustered, not random, and WSDOT posts deer crossing signs accordingly.

The highest number of deer collisions occur during the fall and highest number of elk collisions occur during the winter. The data also confirmed:

  • The majority of sites with unusually high deer-vehicle collisions were associated with posted speed limits of greater than 50 miles per hour.
  • Somewhat lower collision counts were recorded on roads with more curves and vice-versa (straighter roads were associated with higher collision counts.)
  • Lower collision counts were observed on eastern Washington rural interstate highways, eastern Washington urban principal arterials, and western Washington urban minor arterials –at least compared to other roadway classifications.

Comparing the WSDOT data with established landscape databases revealed a few more patterns, including:

  • Cover, forage, and water available near roads were generally associated with higher collision counts in eastern Washington mule and white-tailed deer habitat.
  • Southern aspects (south-facing roadside slopes) were generally associated with higher collision counts in western Washington rural areas.
  • Lower collision counts were associated more with steep roadside slopes (more than 35 degrees) than with moderate slopes (less than 35 degrees).

So what can be done to avoid crossing paths with deer in such a traumatic way?

For the driver, slowing down during fall and winter is the first step, especially in the hours just before, during, and after dusk and dawn. Paying attention to WSDOT's deer crossing signs, and particularly "high kill area" signs, can be critical. Speed limit reductions at night along stretches of highway with a high rate of collisions might be in order. In general, new highway development in high deer or elk use areas should be avoided.

Deer or elk could be protected from collisions with construction of fences along roadways with high collision rates, especially if combined with existing bridges or development of over or under passes to allow natural movement. Such efforts have proved effective in other parts of the country.

WSDOT has a wildlife crossing project underway on the Snoqualmie Pass East section of Interstate 90 and a fencing project complete on Highway 97A between Wenatchee and Chelan. For more information see http://www.wsdot.wa.gov/Environment/Biology/bio_esa.htm#Connectivity.

If you hit and kill a deer or elk, or you see obviously hit and dead deer or elk off a roadway, you can now legally salvage the carcass. The new rule, similar to those in about 20 other states, was adopted by the Washington Fish and Wildlife Commission earlier this year. It applies only to deer and elk killed by motor vehicles and excludes deer salvage in Clark, Cowlitz, and Wahkiakum counties where federal laws prohibit handling endangered Columbian white-tailed deer. You must obtain a free, printable permit from WDFW within 24 hours at http://wdfw.wa.gov/licensing/game_salvaging/, where you can find more details.

Not all collisions with wildlife become roadkill. If you hit and injure a deer or other wild animal, or find an injured wild animal on the roadside, you can call a trained wildlife rehabilitator who might be able to safely retrieve the animal and care for it. (See http://wdfw.wa.gov/conservation/health/rehabilitation/how_to_find.html.)


September 2016

Photo: The fruits of the native sumac tree ripen in fall.
The native sumac tree is among the many native species that provide wildlife habitat.

Now is the time to add shrubs and trees to your landscape

There's no better time than early autumn to add habitat-providing trees and shrubs to your Backyard Wildlife Sanctuary landscape.

Planting in fall gives larger vegetation a head start on root development before the ground freezes and root systems go dormant for the winter. By next spring, these newcomers will be ready to take off, producing food and providing shelter for many species of wildlife.

Fall is also the time when many plant nurseries clear out stock, so you can often take advantage of big price discounts. Before taking in those fall sales, however, think about your available space and what you need or want to change or add. 

Does your present landscape provide maximum food, cover, and safe travel corridors for wildlife? Are there unused lawn areas that could be planted with trees and shrubs? What areas have low diversity and need a better mix of wildlife-friendly plants? Are there solitary trees that could have shrubs and groundcover planted around them? Where would a screen of plantings, such as a tall hedge of deciduous and evergreen shrubs, improve outdoor privacy?

The Washington Department of Fish and Wildlife (WDFW) recommends using local native trees and shrubs in your landscape when possible.  That's because some of the best habitat for native wildlife includes plants that have evolved and occur naturally in your area. Native plants are more closely matched to local soils, climate and wildlife. They will be better, in the long run, at providing the right kinds of food, shelter and diversity needed by wildlife.

An added bonus of using native plants is that they typically need less maintenance and less water than non-natives.

While some native plants are readily available, others may be difficult to find. Check with your local plant nurseries, Washington State University Cooperative Extension (http://ext.wsu.edu/) which  publishes a nursery guide including native plants sources, or Washington Native Plant Society (1-888-288-8022 or http://www.wnps.org.)

Serviceberry, oceanspray, ninebark, dogwood, currant, huckleberry, Oregon-grape, willow, vine maple, sumac, aspen, and juniper are among the many native species that can provide wildlife habitat of one kind or another in your landscape.

When it is not possible to use native plants, choose plants adapted to local site conditions that will provide seeds, berries, nectar (flowers), and good cover. Avoid sterile varieties (those that do not produce fruits of seeds).

Pay attention to sun, water, and soil needs of each tree and shrub species and place them in your yard where they will best flourish and not quickly outgrow the space. Most plants are fairly tolerant but prefer certain conditions. Consider height at maturity and other features such as fall color, showy flowers, aroma, or unique leaf shape.

Keep in mind how plants aid in energy conservation and comfort by letting in winter sun, protecting from prevailing winter winds, and shading the summer heat. Evergreens give winter protection for you and wildlife but will block the sun. Many deciduous trees have good food for wildlife and allow in winter warmth; they do not protect from winter winds.

Note any special problems some plants might have, such as weak wood, messy fruit, over patios, or invasive roots.

You will probably find more than one plant that fits the needs of a certain spot. Cost, availability, and personal preferences for unique features may influence your final selections.

WDFW's book by North Puget Sound regional wildlife biologist Russell Link, "Landscaping for Wildlife in the Pacific Northwest," (http://wdfw.wa.gov/living/book/index.html)  is an excellent source of more detailed information about trees and shrubs in your backyard landscape.


Photo: An eagle feeding young eaglests in nest built high in Douglas firs.
Photo: A pair of eagles perched on branches of dead fir tree.
Sandwiched between the freeway and a subdivision on the edge of suburbia is a bald eagle nest few know about. Photos by Bill Anderson

August 2016

Bald Eagles in Suburbia?
By Jamie Bails, WDFW Habitat Biologist

Sandwiched between the freeway and a subdivision on the edge of suburbia is a bald eagle nest few know about.

It's a well-chosen home, adjacent to a lake where fish are plentiful, and except for the clanging of golf clubs on the course below, it's peaceful.

Once a bird of the wilderness, the bald eagle is now a bird of suburbia.  And it's a classic case of adaptation to available habitat.

As the once endangered bald eagle population has grown, more young eagles surviving to breeding age are looking for nest sites. What they have found are tall, old trees on the outer edges of human communities, places with privacy and abundant access to food.

The unknown nest sits midway up in the tallest Douglas fir tree on the Nile Golf Course in Mountlake Terrace in Snohomish County.  It's protected by western red cedars that hide it from golfers on the greens below. An adjacent snag is perfect for perching and overlooking Ballinger Lake, scanning for invasions by osprey or crows.

This several hundred pound nest is occupied by a bald eagle pair who have successfully raised eaglets here for the past several years.  In the nest this summer I watched two 12-week-old eaglets preparing to fledge, exercising their six-foot wing spans that will keep them aloft as they soar over the lake, and fly north to winter roosts on the river in coming months.

It's an idyllic site to raise a family. There's a grove of mature alders lining the lake that provides nest building materials. The pair returns throughout their lives, often with new partners if one dies. The young also return to the area, seeking food and eventually their own territory when they mature at four to five years of age.

The lake provides a year round source of fish -- black crappie, bullhead catfish, largemouth bass, yellow perch, and resident coastal cutthroat trout. Every spring Washington Department of Fish and Wildlife (WDFW) fish hatchery crews stock thousands of rainbow trout for anglers, who share them with the eagles right when the birds are preparing to hatch and feed young.

As the suburban eagle population grows, nest sites like this one become valuable territory. Throughout the greater Seattle area, eagles are nesting anywhere useable habitat exists, like at Point Edwards and Hutt Park near Edmonds. Any tall, strong, tree within 3,000 feet of a fish-occupied body of water may hold a nest.

As I watched the eagles one afternoon, an osprey came to the lake, calling out its presence. Almost immediately one bald eagle parent was atop the tree squawking, making sure the osprey was also aware of its presence. Looking around, I seemed to be the only person watching the interaction.

Just a generation ago it was a rare occurrence to see a bald eagle.  Prior to the Bald Eagle Protection Act of 1940, the eagle was hunted for sport. At the time of the Bald and Golden Eagle Protection Act of 1962, less than 500 breeding pairs were estimated in the U.S.  Since 1972 when the DDT pesticide was banned to address damage to wildlife high on the food chain, and 1978 when the bald eagle was listed as an endangered species, gentler treatment by humans has led to a dramatic resurgence in eagle populations.

By the late 1990s, breeding populations of bald eagles were found again throughout most of North America. Here in Washington, WDFW protection of breeding habitat helped support an estimated 840 occupied territories by 2005. In 2007 the eagle was removed from the federal endangered species list.

Today, with a total of 1,334 known territories, WDFW is proposing to de-list the population from "sensitive," the lowest category of protection.  Today the nationwide estimated total is 24,000 eagles, and the population is expected to stabilize at 228,000 individuals over the next 20 years.

All across America, our suburbs have become bald eagle habitat for those birds willing to co-exist with humans.  Although up to 78 percent of their diet is fish, they are scavengers that have discovered that food is abundant in places full of humans, including roadkill.

These days, it's almost routine for me to be sitting in a city park and hear an eagle calling overhead.  They perch and soar and even nest above us, often without notice. We hike into the wilderness or float a river to see eagles, yet they have taken up residence in our neighborhoods. 

As the eagle numbers grow, there will be competition for space and eventually the population will reach habitat carrying capacity. We can increase that capacity by keeping tall trees on the landscape, especially around parks and lakes.

Next time you are enjoying an urban park, listen for the distinctive call of the bald eagle whose nest may be closer than you think.

For more information, see WDFW Periodic Status Review for the Bald Eagle.

 


July 2016  

from National Wildlife Federation Magazine
Native, or Not So Much?
Native plants transformed into flashy "nativars" may look pretty, but are they good for wildlife?

By Janet Marinelli

Photo: A native coneflower showing its natural coloring and flowerhead.
Photo: A coneflower that has been cultivated for a double flower head.
It's hard to imagine what butterflies and bees make of the Alice-in-Wonderland-like world of plants that pass as natives at nurseries these days. Bred for Day-Glo foliage, double flower heads, disease resistance and other atypical features, these cultivated varieties of native species, or "nativars," are often the only native plants available at local garden centers—and that could be a problem for wildlife.

It's hard to imagine what butterflies and bees make of the Alice-in-Wonderland-like world of plants that pass as natives at nurseries these days. Bred for Day-Glo foliage, double flower heads, disease resistance and other atypical features, these cultivated varieties of native species, or "nativars," are often the only native plants available at local garden centers—and that could be a problem for wildlife.

As research increasingly shows, native plants are key to creating a wildlife-friendly garden. By definition, a native plant (or "straight species") occurs naturally in a given location or region. A nativar is sometimes a natural variant that has been found in the wild and brought into cultivation, but often it has been developed by a plant breeder and would never be found in nature. In the words of Doug Tallamy, a University of Delaware entomologist and author of Bringing Nature Home, the proliferation of nativars demonstrates the extent to which the nursery trade "is still stuck on the idea of plants as enhanced decoration" rather than as essential to wildlife.

One clue that a plant is a nativar is a fancy, marketing-driven moniker like Razzmatazz or Pink Double Delight, two double-flower variations on the native purple coneflower in which the flower's brownish-orange central cone has been transformed into flashy pink pompoms. Botanical oddities like these may be highly regarded by the nursery industry, but it's difficult, if not impossible, for bees and butterflies to gather pollen and nectar from double flowers. Such enhanced blooms can also be sterile and therefore unable to produce seeds—bad news for the goldfinches and other birds that relish these nutritious treats.

While radically tampering with a species' flower structure often comes at the expense of wildlife, other popular nativar traits may be harmless or even beneficial. But how can gardeners interested in nurturing wildlife distinguish the good from the bad?

To help answer that question, Tallamy and colleagues at the University of Delaware have teamed up with researchers at the Mt. Cuba Center, a Delaware botanic garden specializing in native plants. As part of the project, Tallamy and graduate student Emily Baisden have been studying cultivated varieties of native trees and shrubs to learn how different traits affect the plants' palatability to caterpillars, which are critical to the diets of breeding birds.

Although Tallamy calls the data they've collected during the past two years preliminary, some results are clear. For example, Lanham's Purple shining sumac and other nativars with purple leaves (a coveted trait among the horticulture cognoscenti) are not as attractive to caterpillars as the straight species with green leaves. Tallamy says this is likely because purple leaves are loaded with anthocyanins, chemicals that deter insect feeding. "It's pretty clear that purple foliage goes in the negative column," he says.

The evidence is less conclusive for variegated leaves (right), which are not uniformly green but rather have streaks or blotches of different colors. Such leaves contain less chlorophyll, the green pigment that enables plants to photosynthesize: employing sunlight to convert carbon dioxide and water into food. Presumably, the more variegation, the less nutritious the leaves are for wildlife.

According to Tallamy, however, tests of caterpillar feeding preferences produced mixed results. Spring bagworm larvae actually favored variegated leaves, although during the course of the growing season most caterpillars avoided them. As more data are collected this summer, Tallamy says, "maybe this will become more clear."

Some nativars have larger or more abundant fruits, and these appear to be more appealing to caterpillars than the straight species. A prime example is the Chandler highbush blueberry, which produces huge berries the size of cherries.

Changes in plant size or "habit," such as nativars that grow more compactly or more upright than straight species, "didn't seem to make any difference to wildlife," says Tallamy. Neither did nativars that are bred for disease resistance such as the Princeton elm. That's good news for the American elm, which has been devastated by Dutch elm disease throughout its native range in the United States and Canada, and also for the growing number of other native trees suffering from blights introduced from abroad.

While disease-resistant nativars can be a boon for a plant decimated by blight, others can have a less salubrious effect on the genetic health of a species. By definition an atypical plant, a nativar represents just a sliver of a species' genetic diversity. What's more, to maintain their atypical traits, most nativars are propagated through cloning, such as by rooting cuttings, which produces genetically identical plants. When mass produced and overused in the landscape industry, they result in less genetic diversity than straight species propagated from seed, and therefore provide native plants with less capacity to adapt to stresses ranging from disease to climate change.

"It is a bad idea to load the landscape with plants that have no genetic variability," says Tallamy. "I'm not a hardliner on this issue, but gardeners ought to have access to straight species. We have to convince the nursery industry that native plants are about more than just looks."

 


Photo:  Great blue heron in nest high in trees.
Even amidst fully-leafed-out trees at this time of year, it's hard to miss a great blue heron (Ardea herodias). - Bill Anderson photo

June 2016

Puget Sound's Great blue herons provide summertime watching
By Jamie Bails, WDFW habitat biologist

Even amidst fully-leafed-out trees at this time of year, it's hard to miss a great blue heron (Ardea herodias).

Four feet tall with a six-foot span of blue-feathered wings, this big bird is mostly beak, neck and legs. It's commonly found in both rural and urban areas of every Washington county and can be even more noticeable in the spring and summer because it nests communally, in large groups called heron rookeries or colonies.

Although widely recognized, much is still unknown about foraging, seasonal dispersal, habitat associations and winter distribution of the great blue heron. Many eastern Washington herons migrate south in the fall, but others, especially on the west side of the state, are year-round residents.

The non-migratory Puget Sound population is classified as a sub-species (Ardea herodias fannini) found only in the Salish Sea, a broad area that stretches from Prince William Sound to south Puget Sound.  What we DO know is that these herons are an important indicator of the health of Puget Sound.

According to "Great Blue Herons of Puget Sound," a technical report by Ann Eissinger published by the Puget Sound Nearshore Partnership, 49 percent of this population is concentrated in four mega-colonies of 200-600 heron pairs. The remaining 51 percent is in small to medium colonies of less than 200 pairs, scattered along the Puget Sound shore from Bellingham to Olympia.

Many of the largest nest sites are in northern Puget Sound near eelgrass beds on marine shorelines, like the March Point colony in Padilla Bay, where several dozen herons are frequently seen wading to feed on herring, shrimp, crabs, sculpins, starry flounder and other aquatic life.

In south Puget Sound, where eelgrass is not abundant, smaller colonies are distributed by tree availability, access to marsh foraging areas and prey abundance. These smaller southern colonies usually breed earlier than those of the north and Strait of Georgia.  

Based on Eissinger's observations over 25-plus years, some mega-colonies appear to fragment, with herons relocating to new and existing nesting sites, usually closer to productive marine feeding areas.

For example, a Point Roberts colony of nearly 400 nesting pairs began to fragment in 2002-2003, with about 350 pairs moving about two miles north to the Tsawassen bluff, directly above their primary feeding grounds at Roberts Bank.  Another case was the Birch Bay colony of about 275 nesting pairs, which fragmented and relocated between 2006 and 2008 to a new site at Drayton Harbor with about 100 nests, and to the Lummi Bay colony, which grew by 50-100 nests.    

Most great blue herons begin the reproductive cycle in early February, gathering at these traditional communal nest sites. These sites are usually in tall deciduous trees such as alder, cottonwood and big leaf maple, but also cedar, hemlock and pine, and near foraging habitat like an estuary or other waterway.

By March the male of each pair is providing sticks for the female to build a nest or renovate an old nest. She lays three to five eggs, and both take turns incubating them for almost a month. By the end of May the eggs begin to hatch, and chicks grow rapidly, fed by both parents. The chicks first leave the nest at 7-8 weeks but usually return to be fed for another few weeks.

Photo:  Three Great blue heron fledglings being cared for until they can make it on their own.
Just this month these three of six great blue heron fledglings were found on the ground near a Puget Sound colony, some injured and all unable to fly. They are currently under the care of state licensed wildlife rehabilitators at the Lynwood-based Progressive Animal Welfare Society (PAWS) and will be released later this year when they are able to make it on their own.

By the end of September, the juveniles have fully fledged and disperse with adult females to upland rivers, lakes and wetlands to find prey. There they stay through the winter, roosting nightly at forest edges on lateral branching trees. Voles and other small mammals, reptiles and amphibians provide easy and abundant food around fields and marshes, and winter-returning salmon are taken from rivers and beaver ponds. Adult male herons maintain their shoreline territory over winter.

Puget Sound's mega-colonies of great blue herons act as an anchor for an overall resilient population, but by being concentrated they are susceptible to disturbance, both natural and man-made.

For example, in the 1990's a large ice storm destroyed the colony at Squaxin Island near Olympia, killing all the nest trees. If a major oil spill were to occur in Padilla Bay, the largest heron breeding center in the Salish Sea -- March Point and Samish Island colonies -- could be seriously impacted.

Smaller colonies might be at greater risk of competition with other species or predation. At Edmonds Marsh, herons have tried to establish nests over the last dozen years, but fledglings have not yet been documented.  Many heron-watchers assume nearby mature bald eagles are thwarting the herons' efforts.

On the other hand, a bald eagle nesting pair near several heron nests at Point Roberts is more likely protecting both species' territory from raids by crows, ravens or immature eagles.  

Over the years, heron watchers throughout Puget Sound have seen both large and small colonies shrink, grow, and completely disappear.  In 2010, the Kiwanis Ravine colony included some 80 successful nests, but by 2014 there were none.

The now abandoned Black River colony in Renton once supported 130 nests. Today the Lake Sammamish State Park and Kenmore Park & Ride colonies are the largest in the Pierce/King/Snohomish county area.

Eissinger has noted that many Puget Sound herons are well-adapted to human disturbance, including dogs, motor vehicle traffic, and industry noise. Nevertheless, heron colony watchers need to keep a respectful distance from nests. Keep pets on leash, minimize noise, and bring binoculars, scopes and telephoto camera lenses to enjoy these big birds.

 


Photo:  Landscape designed to provide habitat for birds, bees, butterflies and other animals.
Western hemlock (Tsuga heterophylla), Washington's state tree, is favored by elk and deer for its delicate feathery foliage, and juncos, siskins, chickadees and squirrels for its seeds.

April 2016

Plant a tree for wildlife this month

April is the month of Arbor Day and Earth Day, and this year both are promoting something we advocate for wildlife habitat -- tree planting.

Arbor Day has always been about planting trees, starting in 1872 in Nebraska and officially celebrated nationwide on the last Friday of April. Washington state traditionally celebrates Arbor Day the second Wednesday of the month, April 13 this year.

Earth Day began on April 22, 1970 at the start of the movement when the Environmental Protection Agency (EPA) was formed and the Endangered Species Act and other environmental laws were passed. 

This year's Earth Day theme is "Trees for the Earth -- Let's get planting!"  This effort will continue over the next four years with a national goal of planting 7.8 billion trees by the 50th anniversary of Earth Day in 2020 to help combat climate change.

How can something as simple as a tree address something as complex as climate change?  Trees absorb excess and harmful carbon dioxide in our atmosphere. In a single year an acre of mature trees absorbs the same amount of carbon dioxide produced by driving the average car 26,000 miles.

Trees help us breathe clean air by absorbing odors and pollutant gases (nitrogen oxides, ammonia, sulfur dioxide and ozone) and filtering particulates out of the air by trapping them in their leaves and bark.

Trees save us energy, up to 30 percent in cooling costs when properly planted around a house to shade sunny south and west sides. They can provide food and income, too.

And of course trees are critical to wildlife, providing nesting sites, roosting spaces, escape cover, and food for a diversity of native mammals, birds, reptiles and amphibians, and invertebrates like butterflies and moths.

So let's get planting!

Tree species native to Washington are your best bet, not only for native wildlife but for ease of care and long-term sustainability. The following are among good choices, depending on your landscape:

  • Big-leaf maple (Acer macrophyllum) is a fast-growing tree suited for large landscapes that provides homes for cavity-nesting birds and food for insectivorous birds like woodpeckers and nuthatches.
  • Douglas maple (Acer glabrum douglassii) is a small tree used for its seeds by grosbeaks, quail and grouse, for its twigs and bark by deer and beavers, and as a larval host for some moth species.
  • Vine maple (Acer circinatum) is best suited for westside landscapes where it grows naturally in groups as large understory shrubs or small trees. It's a larvae plant for brown tissue and polyphemus moths, a good nectar source for bees, and seed-producer for a variety of birds.
  • Oregon white oak or "Garry oak" (Quercus garryana) is a thick-limbed, long-lived tree that is Washington's only native oak. Like all oaks, it produces acorns loved by everything from Clark's nutcrackers to tree squirrels, and at maturity they often provide cavities for nesting and roosting by both birds and mammals.
  • Pacific dogwood (Cornus nutallii) has large, creamy-white, showy flowers eaten by spring azure butterfly larvae. A diversity of birds, including bluebirds, sapsuckers, white-crowned and song sparrows, tree swallows, towhees, and vireos eat its fruit.
  • Cascara (Rhamnus purshiana) is a native small tree or tall shrub that grows well in disturbed sites. Its berries are eaten by grosbeaks, grouse, jays, robins and tanagers, as well as bears, foxes, coyotes and raccoons.
  • Native birches (Betula spp.) are hardy clump-growers to plant far from drain pipes or foundations, but they produce lots of wildlife habitat: seeds for juncos, siskins and other birds; insects for kinglets, warblers and other birds; bark for nesting material; leaves for mourning cloak and swallowtail butterfly larvae; twigs for elk, deer and small mammals; cavities for birds and other wildlife.
  • Native hawthorns (Crataegus spp.) are more shrub-like than tree, with densities that often provide good escape cover for songbirds. Berries are favored by robins, waxwings, wood ducks, turkeys, black bears, coyotes and foxes, to name a few.
  • Native pines (Pinus spp.), which can be fast-growing large trees best suited for larger properties, provide nesting sites for many songbirds and seeds for, among others, crossbills, mourning doves, jays, finches, siskins, and chipmunks.
  • Douglas-fir (Pseudotsuga menziesii) grows quickly with a dense screen of soft needles that are used by silver-spotted tiger moth larvae, among others; its seeds are eaten by grouse and many songbirds, its associated insects are eaten by brown creepers and woodpeckers, its twigs are browsed by deer and elk; at maturity its cavities harbor flying squirrels and other animals.
  • Western hemlock (Tsuga heterophylla), Washington's state tree, is favored by elk and deer for its delicate feathery foliage, and juncos, siskins, chickadees and squirrels for its seeds.

Lots more detail about these and many other trees for wildlife is available in the book by WDFW wildlife biologist Russell Link, "Landscaping for Wildlife in the Pacific Northwest" (http://wdfw.wa.gov/living/book/index.html .)

Certified arborists are excellent professional resources on tree planting, care, and maintenance, and can be found through the Pacific Northwest chapter of the International Society of Arboriculture (http://www.pnwisa.org/.)

For more information about Arbor Day, including details on how to properly plant a tree, see http://www.arborday.org.

For more information about this year's Earth Day campaign, see http://www.earthday.org/2016/ .

 


March 2016

Photo:  Landscape designed to provide habitat for birds, bees, butterflies and other animals.
Landscape designed to provide habitat for birds, bees, butterflies and other animals.

Plan your garden for wildlife now

Gardeners have been daydreaming over seed catalogues since New Year's, but with actual Spring finally within sight now, it's time to place orders and make those dreams come true.

Those who also garden for wildlife will want to keep the birds, bees, butterflies, and other animals in mind when making those seed and plant selections.

Lots of varieties of annuals and perennials, plus garden vegetables, can provide food for wildlife with nectar-producing blooms and/or attract pollinating insects that become part of the food chain for others.

So how do you choose from all those enticing catalogue pictures and listings?

Washington Department of Fish and Wildlife (WDFW) biologists recommend using local native plants when you can, or non-natives if they're not invasive in your local area.

"Don't choose hybrids with double flowers because the flower structure may prevent flying insects from gaining access to nectar or may even have nectar-production bred out," said WDFW's North Puget Sound regional wildlife program manager Russell Link.

WDFW's Backyard Wildlife Sanctuary program information (available at http://wdfw.wa.gov/living/backyard/ ) includes some specifics about plant choice to benefit wildlife, like hummingbirds and butterflies. These include both local native and non-native plant species, but natives are usually best.

Links says plants that are native to local habitat in Washington are best suited for our soils and climate so they usually grow more easily. By nature of being native, they have the potential to be truly "sustainable".

The appropriate native plant usually require less care, especially watering, once they are established. And most important to wildlife enthusiasts, many native plants are more readily used by the native wildlife with which they evolved.

Plant and seed catalogue companies from across the country may include species "adapted to the Northwest," but remember that is not the same as "native to the Northwest."

Thanks to increasing interest in "sustainability," sources of native plants and seeds are increasing in Washington. The Washington Native Plant Society (WNPS) provides a list of nurseries by county that sell native plants and seeds (see http://www.wnps.org/landscaping/nurserylist.html.)

Whether you go native or use non-invasive exotics, keep those pollinators in mind.

"I buy a lot of "six packs" from a local nursery," Link said, "and when shopping, I'll give the flats of flowers a little shove to see what flies off. Some flowers, like Sweet allysum, will produce a flurry of of flying pollinators."

Link also notes that most vegetables are pollinated by flying insects.

"I grow scarlet runner beans because they have attractive red flowers, are tasty, and attract bumblebees and hummingbirds," he said.

Some plants pollinated by insects specifically attract night-flying moths that provide food for bats, including Sweet William, Fireweed, Honeysuckle, Bee balm, Mock-orange and Yucca. Bats Northwest has more information on moth-friendly plant species at http://www.batsnorthwest.org/attracting_insects.html .

Link's book, "Landscaping for Wildlife in the Pacific Northwest," is a good source of further information on plant choices for the wildlife garden. For more details on how to purchase this reference, see http://wdfw.wa.gov/living/book/index.html .

 


 

February 2016

Photo:  Nestbox hung on tree.
Now is the time to get your bird nest boxes cleaned out and ready for new, incoming occupants..

Get nest boxes ready for new occupants

Spring may officially be several weeks off, but now is the time to get your bird nest boxes cleaned out and ready for new, incoming occupants.

If you don't already have nest boxes up, this is the time to either build or buy and place them, following our specs at http://wdfw.wa.gov/living/projects/nestboxes/index.html.

Many backyard birding enthusiasts who use nest boxes leave them up year-round and leave nesting materials in them through the winter, when some birds will use them as nightime roost sites.

But migrating birds that use cavities for nesting, like bluebirds, swallows and wrens, will be returning next month and they prefer clean quarters to follow their instincts to build their own nests.

All nest boxes attract insects – mites, lice, fleas, flies, hornets, spiders and more. In small numbers they are relatively harmless to birds, but in larger numbers they can cause injuries and even fatalities to young birds.

Inspect all nest boxes to clean out insects and also to remove the old nesting material. Although some diligent and industrious birds will remove old nesting material before building their own particular nest, many more will just build on top of an old nest. That kind of layering can raise the nest dangerously close to the entrance hole where predators might reach eggs or young.

Your inspection may turn up dead nestlings or infertile eggs, which of course should also be removed. Be sure to use protective gloves, maybe even a dust mask, and dispose of everything you find in nest boxes away from the site to avoid smells that can attract predators.

Nest box maintenance includes tightening screws, loosening lag bolts, unblocking drainage holes, and generally making sure everything is secure and working right.

If you find a nest box in your collection that year after year goes unused, consider relocating it. It might not be in the appropriate habitat or suitable height location for the species it's built for, or perhaps it's in the right place but is not built correctly. Check the entrance hole size, overall size dimensions, and other factors that are important to, and different for, various species of nest-box-using birds. Details are available at http://wdfw.wa.gov/living/projects/nestboxes/index.html .

If the same nest box turns up dead nestlings or infertile eggs more than once, consider relocation to avoid competitors or predators, or remodeling to protect the species using the box. A predator block – just a one-inch thick piece of wood drilled with the appropriate size hole – mounted over the entrance hole to create a short tunnel into the nest, can deter starlings, raccoons, or squirrels that have chewed the original hole bigger.

Another improvement is to remove any perch post projecting out from the front of a nest box. Our native cavity-nesting birds don't need these perches but they are used by more aggressive non-native birds to harass nesting birds.

If you often have earlier-arriving starlings or English house sparrows dominating your nest box site, you may want to plug the entrance hole until later this spring when martins or swallows or other native species arrive.  Small paper cups and other such plugs work well.  Remember to remove the plug as soon as you see your "target" species return to the area, or when you otherwise learn of its return to your area. (Online birding chat groups can be a good source of news about migratory bird movements.)

If you watch a nest box closely enough this spring to know when birds have finished raising a brood, you can clean out the box again to encourage another pair to use it or the same pair to nest again. Just don't bother an obviously occupied nest box.

 


 

January 2016

Photo: Bobcat (Lynx rufus) in the snow.
It's the most common forest feline that we never get a chance to see -- the bobcat (Lynx rufus).

Rare sighting of common wildlife is memorable
By Jamie Bails, WDFW habitat biologist

It's the most common forest feline that we never get a chance to see -- the bobcat (Lynx rufus).

My chance came on a drizzly morning in late October on a hike near Skykomish. We drove up the long, gravel road to an empty trailhead, complaining about the rain and missing the spectacular view. But a hike in the rain meant solitude in the Wild Sky Wilderness, so we donned raincoats and loaded backpacks with camp stoves, trail mix and packets of tea.

We went up the steep trail, chatting while our dogs stayed close by. Clearing another switchback, the path leveled out as we approached a south-facing ridge covered in young alder.

Suddenly my friend's dog jumped off the trail into the thick brush, sniffing the base of an old spruce tree. Stopped in our tracks, I heard her whisper "It's a bobcat!"

Just 20 feet away, balanced on the end of an alder branch, he sat, eyes wide open, staring at us, his mouth opening wide to hiss us away. Four paws tightly gripped the thin, bending branch, but his body was perfectly balanced in the air, like a walker on a tightrope. His body arched, thick fur standing on end, posed for escape.

I could barely see his eyes through the drizzly haze, but he did not blink. For a long minute I stared at him through the mist, holding my breath as I watched a wild cat in a tree, the first wild cat I had ever seen.

While bobcats are considered common enough in Washington to be classified as a small game and furbearer species that can be hunted and trapped, few people see them. As stalking predators they make it their job not to be seen. And if they are spotted, they disappear as quickly as they came, leaving you wondering if you ever saw it at all….

Bobcats, a close cousin of the Canada lynx (Lynx canadensis), are widely distributed over North America, ranging from southern Canada through the continental U.S. to southern Mexico. They are found in all habitats, from boreal forests to coniferous mixed forests, hardwood forests, coastal swamps, deserts and scrublands.

In Washington, bobcats are generally found below 4,000 feet elevation, mostly in wooded areas with escape cover, including suburban areas. In western Washington adult males have a home range of two to six square miles, half that for females. Eastern Washington bobcats have larger home ranges.

A male will mate with each of the several females who overlap his territory, and females will mate with several males. Each female may raise between two and four kittens a year depending on prey availability. The kittens are born in the spring and stay with mom for nine to 12 months, learning to hunt for themselves until they naturally disperse in late fall or early spring.

Bobcats are most active at dusk and dawn, hunting by sight and sound, watching and listening while perched on a stump or behind a tree, their spotted coats blending neatly with forest.

That spotted coat varies widely in color from tan to grey to reddish, as is more common on the west side of the state. They are named for the short bob tail, only up to six inches long, painted with black stripes at the top and bottom. Their back legs are longer than the front, which enable long leaps up to ten feet, and thick paws cushion the landing when they hit the ground. Males are larger, weighing up to 30 pounds and measuring over two feet long. Bobcats tend to be larger in the north and typically live 12-15 years in the wild.

The bobcat is an adaptable hunter, preying on anything from voles to rabbits to mountain beaver; it will even take prey twice its size. Once prey is sighted, bobcats stalk for a short distance, moving stealthily through the forest by placing their back paws in line with the front, followed by a quick leap and pounce on to the prey. If the prey is large, like a sick or weak deer, they stash it, covering it with brush and revisiting it until the prey is consumed. In suburban areas, bobcats may occasionally take a weak or sick, feral or domestic animal, but that is not typical.

Bobcats even share a prey species with their rare Canada lynx cousins – both cats hunt snowshoe hares. Bobcats aren't as well suited for deep snow conditions as lynx, which have longer legs and bigger, snowshoe-like feet. But over time, the smaller bobcat has adjusted to varying food and habitat conditions, surviving as more of a generalist in areas where the lynx cannot. As the climate changes and snow levels recede, the survivalist bobcat may take on territory and ranges once inhabited by the lynx.

The bobcat's curious nature often leads it into traps, says Brian Kertson, Washington Department of Fish and Wildlife (WDFW) carnivore specialist and researcher. In a cage trap set to catch a cougar for radio-collaring, he often finds a bobcat feeding on a free meal. Using a stick, he coaxes the bobcat out of the trap and resets it for the cougar. "The bobcat is full of piss and vinegar," he says, "and not easily discouraged from traps."

Bobcats spend the day sleeping in secluded hollow logs, stumps or brush piles, avoiding contact with other mammals, being solitary and unsociable. As I saw, they climb trees with ease when inadvertently disturbed.

Continuing up the trail, we quietly left the bobcat to return to its daytime sleeping spot, huddled inside the roots of that old spruce tree, awaiting dusk to search for a nighttime meal.

Finding a bobcat to experience an encounter like this is a long shot. But this winter, no matter the weather, take a long walk on a forgotten trail along the forest fringe, and don't be surprised if a bobcat finds you first.

To learn more about bobcats in Washington, see http://wdfw.wa.gov/living/bobcats.html