A polar bear eating from a whale carcass. (The Polar Bear Family & Me - BBC)

A polar bear eating from a whale carcass. (The Polar Bear Family & Me - BBC)

A polar bear and her cub investigate the remains of a whale. (To the Arctic)

A polar bear and her cub investigate the remains of a whale. (To the Arctic)

A polar bear smells a seal under the ice. Unfortunately for the bear, the ice is too thick. (Planet Earth Live - BBC)

A polar bear smells a seal under the ice. Unfortunately for the bear, the ice is too thick. (Planet Earth Live - BBC)