Polar bears are fully equipped for Arctic life. They have large paws with furry soles to help them walk on snow and ice; their thick coat of white fur acts as camouflage and insulation; and a layer of blubber acts both as a store of energy and a defense against the cold.
While the bears are built to thrive in the harsh environment, it's global warming that's the real threat. Arctic sea ice is melting earlier than ever before -- this time summer sea ice reached an all-time low -- making hunting at sea increasingly challenging for the polar bears.
Amazing Cold-Weather CreaturesThese 15 animals thrive in extremely cold climates around the world