My favorite organism is the arctic fox, or alopex lagopus.
The arctic fox lives in the Taiga (Boreal Forest) and Tundra biomes. They are white in winter and brown/black in summer; and their fur is the warmest of all mammals. They weigh between 6 and 10 pounds and are only about a foot tall. They mate in March and April and can produce up to 15 pups. Arctic Foxes hunt small mammals and eat vegetables. They also scavenge and bury food for later. Polar Bears and hunters that desire their fur are the Arctic Fox’s only real threats. These animals have thick hair and dense padding on their paws to accommodate for the snow and ice. Their bodies are compact, with small features, that have also adapted this way for the cold climate in which they live. The Arctic Fox makes its home in burrows or dens underground, sometimes originally made from other animals. They can run quickly and are well camouflaged.http://www.saskschools.ca/~gregory/arctic/Afox.html