National Geographic : 1938 Aug
Photograph byCaptain C.T.Pedersen READY TO DEFEND HER CUBS WITH FANG AND CLAW, MOTHER POLAR BEAR SNARLS A WARNING TO TWO-LEGGED INVADERS OFHER DOMAIN With a circumpolar distribution and a reputation for aggressiveness, the big mammal, one of the largest of the bears, swims and dives with agility. Seals form thebulk of its diet. Bristles on the feet facilitate walking on ice. The young are born during the winter inacavern inthesnow.