Mountain Hare

The mountain hare or arctic hare (Lepus timidus), also known as blue hare, tundra hare, variable hare, white hare, snow hare, alpine hare, and Irish hare, is a species of hare that is largely adapted to polar and mountainous habitats in the Palearctic realm. It is a large hare, slightly smaller than the European hare and identifiable by its tail, which is completely white throughout the year. Mountain hares have a brown coat in summer and white to grey in winter. Their diet is highly adaptive to their environment, but is generally made up of plant matter such as grass, twigs, and bark.

Excerpt from the Wikipedia article Mountain hare, by its authors, under the CC BY-SA 4.0 licence.