Female polar bear (Ursus maritimus) nursing its two cubs on a barrier island in the Arctic National Wildlife Refuge. The polar bear is a large bear native to the Arctic and nearby areas. It is closely related to the brown bear, and the two species can interbreed. The polar bear is the largest extant species of bear and land carnivore, with adult males weighing 300??00 kg. Polar bears are found in the arctic regions of Canada, Alaska, Greenland, Russia, and Norway. Photographed in the Arctic National Wildlife Refuge, Alaska, USA.