The biggest carnivores of the bear species, polar bears feed on the fat of ice-based seals. A substantial layer of adipose tissue under their fur offers insulation and buoyancy. The lengthy neck and slim skull of the polar bear likely aids in streamlining the animal in the water even as warming the air that they breathe.Their front feet are huge, flat and oar-like, making them first-rate swimmers. The seals offer food apart from the different Arctic wildlife animals, giving polar bears a crucial role in their ecosystem.