Thick fur and a layer of fat (blubber) keep them warm in frigid temperatures.
Dense fur and the ability to change coat color with seasons for insulation and camouflage.
Layered feathers and a layer of fat, along with huddling behaviors to conserve heat.
Thick fur, large paws for walking on snow, and a long tail for balance and warmth.
Thick fur, specialized hooves for walking on snow and ice, and a layer of fat.
Blubber for insulation, tusks for hauling out on ice, and thick skin.
Long, shaggy coats with a fine underlayer called qiviut for insulation, and herd behaviors for warmth.
Thick fur and a powerful build to travel through snow and withstand cold temperatures.