Mountain Hare

Overview

The Mountain Hare (Lepus timidus), celebrated across northern Europe as the blue hare, tundra hare, or white hare, is a cold-adapted, relict lagomorph indigenous to the arctic tundras, boreal peat bogs, and alpine moorlands of Eurasia. Representing the ancestral lineage that recolonized the deglaciated landscapes of northern Europe following the Last Glacial Maximum, this resilient herbivore thrives in some of the most unforgiving sub-zero environments on the planet. Renowned for its seasonal coat polymorphism—shifting from a soft greyish-brown summer pelage to a dazzling, snow-white winter double coat—the mountain hare is an iconic emblem of the boreal wild.

Ecologically, Lepus timidus is an essential primary consumer and keystone prey species that sustains a diverse guild of northern and montane apex predators. Mountain hares constitute the primary dietary foundation for golden eagles, gyrfalcons, snowy owls, Eurasian lynx, Arctic foxes, and red foxes across the palearctic tundra and Scottish moorlands. By grazing on coarse moorland heathers and browsing alpine dwarf willows, mountain hares shape the structural composition of subalpine heathlands, preventing shrub encroachment and maintaining open mosaic habitats essential for wading birds.

Biology and Physical Characteristics

The morphology of Lepus timidus exhibits profound cold-climate adaptations that distinguish it from the sympatric European brown hare (Lepus europaeus). Its ears are noticeably shorter—reducing heat loss from vascular blood vessels during howling blizzards—and tipped in permanent, velvety black. Its hind feet are exceptionally large and broad, densely coated with stiff, brush-like bristles that expand surface area to prevent sinking into deep, uncompacted snowdrifts. In winter, the animal grows a thick, two-layered fleece of hollow, air-filled white hairs that trap body warmth and reflect high-latitude sunlight, delivering superb camouflage. In Ireland, the endemic subspecies (Lepus timidus hibernicus) rarely turns completely white, retaining a distinctive russet-brown or ‘blue-grey’ winter coat suited to mild, snowless Atlantic bogs.

Behavior and Ecology

Mountain hares are predominantly nocturnal and crepuscular, spending daylight hours concealed in shallow depressions in the peat or snow known as ‘forms’, positioned with their backs to the wind beneath overhanging heather or rock ledges. When heavy blizzards strike high alpine plateaus, hares excavate snow burrows up to a meter deep into drifts, sheltering in thermal comfort until storms pass. During the early spring breeding season, solitary hares congregate for dramatic courtship rituals: males compete in athletic chasing matches, and unreceptive females stand upright on their hind legs to ‘box’ overly persistent suitors with their front paws.

Conservation and Human Impact

Lepus timidus is evaluated as Least Concern by the IUCN, supported by millions of individuals inhabiting vast, continuous tracts of Russian and Scandinavian taiga. However, isolated relict populations in the European Alps and the Scottish Highlands face acute regional conservation concerns. Primary threats include climate-induced ‘camouflage mismatch’—where hares molt into white coats in the absence of snow cover, suffering intense eagle predation—along with commercial culling on managed grouse moors and competitive displacement by introduced European brown hares at lower elevations.

Interesting Factoid

During severe mountain blizzards, the mountain hare does not flee; instead, it digs a deep, insulated snow cave into a snowdrift, curls into a tight ball, and lets the blizzard completely bury it, staying warm beneath the snow for days until the weather clears.