The polar bear is the largest land predator in the Arctic. It evolved from brown bears about 200,000 years ago and primarily hunts ringed seals on the sea ice. Polar bears are well-adapted to survive in the harsh Arctic conditions with thick fat layers, compact ears and tails, and the ability to swim long distances using their partially webbed forepaws. Their populations are estimated at 20,000 to 25,000 but declining sea ice is threatening their habitat.

1. Polar Bears By Tanya