Overview
The Pygmy Rabbit (Brachylagus idahoensis) is a diminutive, charming creature that holds the title of the smallest rabbit in North America and one of the two smallest rabbits on Earth. Endemic to the vast sagebrush oceans of the American Intermountain West, this palm-sized lagomorph is uniquely specialized to survive in deep sagebrush steppes, being the only North American rabbit that digs its own subterranean burrows.
Biology and Physical Characteristics
Brachylagus idahoensis has a tiny, rounded silhouette with short, rounded ears, short hind legs, and an almost undetectable tail that lacks the white underside typical of cottontails. Its fur is soft, velvety, and slate-grey to yellowish-brown with subtle salmon-colored shading behind the nape. Weighing less than a pound, an adult rabbit easily fits inside the palm of a human hand.
Behavior and Ecology
An obligate sagebrush specialist, the Pygmy Rabbit relies on big sagebrush for up to 99% of its winter food, possessing specialized liver enzymes that neutralize the aromatic, toxic volatile terpenes in sagebrush leaves. Unlike true hares and cottontails, it actively excavates its own complex underground burrow systems with multiple interconnecting tunnels and escape entrances in deep, soft soil.
Conservation and Human Impact
While globally assessed as Least Concern by the IUCN, localized populations have experienced dramatic declines due to agricultural conversion of deep-soil sagebrush flats, cheatgrass-driven wildfires, and energy development. The isolated Columbia Basin distinct population segment in Washington State is federally listed as Endangered, supported by intensive captive breeding and reintroduction efforts.
Interesting Factoid
The Pygmy Rabbit is so small that an adult can comfortably curl up inside a human coffee mug, and it is the only native rabbit in North America that digs its own underground burrows from scratch.