Brachylagus idahoensis

Pygmy Rabbit

Family: Leporidae · Class: Mammalia · Order: Lagomorpha

Conservation status: G4 S3

The pygmy rabbit is the smallest rabbit species in North America, measuring 230 to 290 mm (9.1 to 11.4 inches) in total length and weighing 375 to 500 grams (0.8 to 1.1 pounds). Adults display gray to brownish-gray pelage with white underparts and a small white tail. The ears are proportionally shorter than those of other rabbits, measuring approximately 40 to 50 mm in length. Sexual dimorphism is minimal, though females tend to be slightly larger than males during breeding season. Historically, pygmy rabbits occupied sagebrush habitats across the western United States, including Idaho, Utah, Nevada, California, Oregon, and Washington. The species has experienced significant range contraction, with populations extirpated from much of their historical range. In California, pygmy rabbits persist in limited areas of the northeastern counties. The Columbia Basin Distinct Population Segment in Washington, encompassing Douglas, Grant, Lincoln, Adams, and Benton Counties, represents the most northern and isolated population. Pygmy rabbits are obligate associates of dense sagebrush communities, particularly big sagebrush (Artemisia tridentata). They require areas with shrub canopy cover exceeding 20 percent and average shrub heights of 60 to 80 cm. The species constructs extensive burrow systems beneath sagebrush, with tunnels extending 0.5 to 1.5 meters deep and up to 4 meters in length. These burrows provide protection from predators and extreme weather conditions. Elevational range varies from 600 to 2,100 meters, depending on geographic location. The species exhibits unique behavioral adaptations among North American lagomorphs. Unlike other rabbits, pygmy rabbits are highly fossorial, spending considerable time underground. They are primarily crepuscular, with peak activity during dawn and dusk hours. Sagebrush comprises up to 99 percent of their winter diet, while summer foraging includes grasses and forbs. Breeding occurs from February through July, with females producing one to three litters annually. Gestation lasts 27 to 30 days, resulting in litters of four to eight young. Juveniles remain in natal burrows for approximately three weeks. The pygmy rabbit maintains a Global Rank of G4 (apparently secure globally) but carries a State Rank of S3 (vulnerable) in California, reflecting local population concerns. The Columbia Basin population in Washington was federally listed as endangered in 2003 due to severe habitat loss and population decline. Primary threats include conversion of sagebrush habitat for agriculture, livestock grazing impacts, wildfire, and invasive plant species. Urban development and energy extraction further fragment remaining habitat. Conservation efforts focus on habitat restoration, captive breeding programs for the Columbia Basin population, and protection of existing sagebrush ecosystems. Recent surveys indicate population stability in core areas, though long-term monitoring remains essential for species persistence.

Data from The California Species Project — 14,000+ California species with verified data from CNPS, CDFW, USFWS, and more.