Pygmy rabbit (Columbia Basin population) (Brachylagus idahoensis)

Two pygmy rabbits being held in the palm of the hand
A biologist holds two pygmy rabbits (Oregon Zoo)
Category: Mammals
Ecosystems: Shrubsteppe
State status: Endangered
Federal status: Endangered
Vulnerability to climate change (More details)

Moderate-
High

If you see this species, please share your observation using the WDFW wildlife reporting tool or email us at  wildlife.data@dfw.wa.gov. Be sure to include a photo of the species for verification and location (latitude/longitude coordinates) of your observation. 

The population of Columbia Basin pygmy rabbit is low and is designated as a Distinct Population Segment for protection under the U.S. Endangered Species Act. Conservation threats to the Columbian Basin pygmy rabbit include loss and degradation of shrubsteppe primarily due to conversion and fragmentation of this habitat to cropland for agriculture and development. Corridors of dense shrub cover connecting areas of suitable habitat are critical to recovery efforts. 

Watch this video about efforts by U.S. Fish and Wildlife Service and the Washington Department of Fish and Wildlife to recover the pygmy rabbit in the wake of devastating wildfires and other threats. See more information about Columbia Basin pygmy recovery efforts in the Conservation section.  

Description and Range

Physical description

The pygmy rabbit is the smallest rabbit species in North America. It can grow up to 11 inches long and weigh up to 16 ounces. It has a slate gray coloration that can turn brown during the summer months. Its ears are short and its tail is nearly invisible. Adult females are slightly larger than adult males.

Ecology and life history

A pygmy rabbit sits in the snow in shrubsteppe
A pygmy rabbit in the snow in shrubsteppe

Pygmy rabbits are sagebrush obligates, depending on this habitat for survival. Dense stands of sagebrush provide pygmy rabbits with year-round food and shelter. Native, perennial grasses and forbs provide an important food source beginning in spring and especially in summer and fall and deep, friable soils allow them to construct burrows. 

The pygmy rabbit is one of only two North American rabbits known to dig its own burrows. Burrows are used for shelter, thermoregulation (to regulate body temperature), and safety from predators. Burrow systems are generally found on mounds or gentle slopes. 

Big sagebrush is the primary food source, comprising 90 percent of the winter diet, but grasses and forbs are also eaten in spring and summer. Activity occurs throughout the year, and pygmy rabbits may be active any time of day or night (although most activity occurs during the twilight hours).

Breeding extends from Feb. to July. Specialized natal burrows, where females give birth to young, are excavated separate from residential burrows. Females have two to four litters per year with up to six kits per litter.

Predators include weasels, coyotes, American badgers, hawks, owls, and other carnivorous mammals and birds.

Ten pygmy rabbit tiny pea-size, brown droppings next to a penny on the ground
Pygmy rabbit droppings next to a penny for scale Ann Froschauer - U.S. Fish and Wildlife Service
Geographic range

Pygmy rabbits inhabit sagebrush-dominated areas of the Great Basin in portions of Oregon, California, Nevada, Utah, Idaho, Montana, and Wyoming. The Washington population has been isolated from the remainder of the species' range for at least 10,000 years, and possibly as long as 40,000 to 115,000 years.

The Columbia Basin pygmy rabbit population is geographically and genetically discrete from the remainder of the taxon and this population is significant due to the unique ecological setting (i.e., geologic, climate, soil, and vegetation community) in which it occurs.

Museum specimen records and reliable sight records show that pygmy rabbits once occupied sagebrush habitat in Benton, Adams, Grant, Lincoln, and Douglas counties. Paleontological evidence suggest the species prehistorically had a broader distribution that also included Franklin, Kittitas, Chelan, Yakima, and Whitman counties.

By 2001, only one population remained at Sagebrush Flat Wildlife Area in Douglas County. See the Conservation section for WDFW's pygmy rabbit recovery effort.

The map illustrates potential range and habitat distribution of this species in Washington. For maps of worldwide distribution and other species' information, check out the International Union for Conservation of Nature - Red List and NatureServe Explorer.

Map of Washington showing boundaries of the pygmy rabbit potential range based on its habitat distribution occurring in 8 eastside counties: Adams, Benton, Douglas, Franklin, Grant, Kittitas, Lincoln, and Yakima.
WDFW State Wildlife Action Plan

Climate vulnerability

Sensitivity to climate change

High

Pygmy rabbits inhabit shrub-steppe ecosystems and feed primarily on sagebrush throughout the year. This rabbit is predicted to undergo a major decline in geographic range as a result of climate change, which is expected to bring warmer, drier conditions, including drought, to Washington’s Columbia Basin where the species occurs. These conditions will lead to larger, more frequent, and hotter wildfires, thereby reducing the presence of sagebrush and encouraging the growth of cheatgrass and other invasive plants. Fires also contribute to fragmentation of existing habitat for the species. There are documented declines in pygmy rabbit populations following fires.

Confidence: High

Exposure to climate change

Moderate-
High

  • Increased temperatures
  • Changes in precipitation
  • Drought
  • Altered fire regimes
  • Increased invasive plants
Confidence: Moderate

Conservation

This species is identified as a Species of Greatest Conservation Need (SGCN) under the State Wildlife Action Plan (SWAP). SGCN-classified species include both those with and without legal protection status under the Federal or State Endangered Species programs, as well as game species with low populations. The WDFW SWAP is part of a nationwide effort by all 50 states and five U.S. territories to develop conservation action plans for fish, wildlife and their natural habitats—identifying opportunities for species' recovery before they are imperiled and more limited.
This species is identified as a Priority Species under WDFW's Priority Habitat and Species Program. Priority species require protective measures for their survival due to their population status, sensitivity to habitat alteration, and/or recreational, commercial, or tribal importance. The PHS program is the agency's main means of sharing fish and wildlife information with local governments, landowners, and others who use it to protect priority habitats for land use planning.
A biologist holds a pygmy rabbit before releasing it in central Washington
A biologist prepares to release a pygmy rabbit in central Washington

Conservation Threats and Actions Needed

  • Fish and wildlife habitat loss or degradation
    • Threat: Conversion of habitat to agriculture and development. Habitat fragmentation may hamper recovery efforts.
    • Action Needed: Use landowner incentives, conservation easements, and U.S. Fish and Wildlife (USFWS) Safe Harbor Agreements to protect significant habitats. Coordinate with U.S. Department of Agriculture (USDA) Farm Service Agency (FSA), Natural Resources Conservation Service (NRCS), and USFWS. Recover species in the Columbia Basin through semi-wild breeding, releases, and translocations while working to recover habitat.
  • Resource information collection needs
    • Threat: Causes of the population decline in Washington are unknown, need to monitor status of reintroduced populations closely to determine any potential problems and adjust accordingly.
    • Action Needed: Monitor reintroduced population for potential problems and success, and determine whether recovery actions are effective. Develop survey methods to efficiently detect long-distance dispersers from release site.
  • Agriculture and aquaculture side effects
    • Threat: Poorly-managed livestock grazing may cause degradation of shrubsteppe habitat (decreased quantity and quality of forage) and damage burrow systems.
    • Action Needed: Use land acquisitions, conservation easements and landowner agreements to protect significant habitats. Coordination with Farm Service Agency (FSA).
    • Threat: Old USDA Conservation Reserve Program (CRP) lands do not provide suitable habitat for the species.
    • Action Needed: Smart grazing, fire management, and species population connectivity management programs can be beneficial for wildlife, livestock, and landowners. The department will also continue to engage USDA FSA and NRCS to encourage restoring old CRP habitat to native species through their various programs.  

See the Climate vulnerability section for information about the threats posed by climate change to this species. The species faces grave threats from increasing occurrences of wildfire.

Rabbit hemorrhagic disease has emerged as a concern as well. 

Our Conservation Efforts

The Columbia Basin pygmy rabbit population is genetically distinct, considered to have been isolated for 10,000 years or longer from the rest of the pygmy rabbit population. Large-scale loss and fragmentation of shrubsteppe habitat were likely the primary factors contributing to decline, but once the population dropped below a certain threshold, other factors such as environmental events (extreme weather and fire), predation, disease, and inbreeding likely became threats. 

A major recovery effort is underway for this species. In 2001, with as few as 16 pygmy rabbits known to exist in Washington, the WDFW and the USFWS initiated a captive breeding program with the intent of reintroducing rabbits to the wild, but none of the pygmy rabbits from the first release in 2007 survived beyond the first year. Since 2011, thousands of pygmy rabbits have been released into the wild on Sagebrush Flat Wildlife Area in Douglas County and on The Nature Conservancy Preserve in the Beezley Hills in Grant County as a result of collaborative recovery efforts between WDFW, USFWS, the Oregon Zoo, Washington State University, other state wildlife agencies, Northwest Trek, The Nature Conservancy in Washington, and Conservation Northwest. 

Initially, pygmy rabbits were reintroduced to Washington through captive breeding of purebred Columbia Basin pygmy rabbits, but due to a lack of genetic diversity in the remnant population likely from inbreeding depression, rabbits were later intercrossed with pygmy rabbits from populations outside Washington. In 2015, the reintroductions failed in the Beezley Hills Recovery Area for unknown reasons and failed again in 2017 due to wildfire, but reintroductions in the Sagebrush Flat Recovery Area are re-establishing a small wild population.

The majority of the wild pygmy rabbit populations occur on private lands owned by farmers enrolled in the USDA’s Conservation Reserve Program. Biologists continue to closely monitor released pygmy rabbits to collect data on breeding, habitat use, survival, mortalities, and other factors to modify reintroduction techniques and manage the rabbit population. 

 

Resources

WDFW Publications

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