Polar Bear

Although it looks white, Polar Bear fur is actually transparent and hollow and traps heat from the sun. The skin under their fur is black and absorbs the sun's heat. They also have a thick layer of fat so overheating can be a bigger problem than staying warm. Polar Bears can swim 6 mph—up to 100 miles at a time—and run as fast as 25 mph.

Polar Bears live only in the Arctic. Loss of sea ice has a critically adverse effect on Polar Bears. They hunt from the edge and build snow dens on the ice for resting and raising their cubs. Sea ice decline could open the Arctic to shipping and tourism, further disturbing Arctic habitats. Other threats are oil development and industrial pollution that reaches the Arctic through air and ocean currents.

Other animals effected by climate change

Whooping Crane
Before 1800 there were an estimated 10–20,000 Whooping Cranes in North America. By 1941, because of hunting and habitat destruction, there were fewer than 20. There are now approximately 350–380 in the wild. The wild Whooping Crane population has only one winter habitat—a wildlife refuge on the Gulf Coast in Texas; and one spring breeding habitat—a prairie wetlands in Alberta. Severe storms, sea level rise, drought, industrial development and oil spills threaten these habitats. Another significant threat to young Whooping Cranes is colliding with power lines in their migration corridor.

Adelie Penguin
In winter, the sun doesn't rise south of the Antarctic Circle. If Antarctic sea ice decreases and does not extend far enough to the north, Adélie Penguins, during their winter migration, may not be able to reach the sunlight needed to navigate, hunt and avoid predators—they won't dive in the dark. Other threats are oil pollution, fishing and disturbance of colonies from research stations and aircraft.

Narwhal
The Narwhal lives mainly in the Atlantic Arctic. Because of specialized habitat, narrow range and limited diet (Arctic cod and halibut), it is one of the Arctic species most vulnerable to climate change. The Narwhal breeds in bays and fjords, moving offshore during winter to areas of heavy ice pack, breathing through the few cracks. Sudden or extreme temperature change can cause these cracks to freeze shut, trapping the whales. Other threats are illegal hunting, industrial activities, and risks from oil development, exploration and shipping in the Arctic.

Arctic Fox
The Arctic tundra is a region of shrubs, grasses and permanently frozen subsoil. Warming could change the tundra to boreal forest—habitat for the Red Fox. The Red Fox, a predator and a competitor for food, is already beginning to migrate north into the Arctic Fox's territory. Milder tundra weather also causes changes in the population of lemmings and rodents—main food for the Arctic Fox.