Arctic Hare (or Polar Rabbit)

Hare & Jackrabbit

The arctic hare (Lepus arcticus), or polar rabbit is a species of hare which is adapted largely to polar and mountainous habitats. The arctic hare survives with a thick coat of fur and usually digs holes under the ground or snow to keep warm and sleep. Arctic hares look like rabbits but have longer ears and can stand up taller, and can live/maintain themselves in cold places unlike rabbits.

http://en.wikipedia.org/wiki/Arctic_Hare