Polar Bears are the largest land-dwelling carnivores. A male polar bear can weigh between 800-1,500 pounds, and they have four inches of thick blubber that insolates them from the cold. Polar bears eat seals and fish, small mammals, and birds.
They also scavenge human beings when they are ravenous, and they have been known to eat berries; however, their diet is comprised of mostly seal. When the ice over the sea melts in summer, the polar bears can't see to hunt for seals very easily so, they fast all summer long, and this is why they eat so many seals in the winter.