"Polar Bears at a Glance"

"• Polar bears are the world’s largest land carnivores.

"• The bears are usually classified with marine mammals because they depend on the sea for food and can swim for miles. They use their front paws as oars and their rear paws as rudders.

"• The soles of the polar bears’ feet feature small bumps and depressions that act as suction cups and prevent the bears from slipping on the ice.

"• Fur and fat insulate the bears so well that they can scarcely be detected with infrared photography.

"• The bears have a sense of smell so keen that they can detect a seal nearly a half-mile away.

"• Polar bears can run at speeds up to 25 miles per hour over short distances. They average about six miles per hour on longer jaunts.

• Unlike other bears that slow down their metabolism only when food becomes unavailable in the fall, polar bears experience a decrease in metabolism whenever food is lacking for a week to 10 days."

There's a lot more here.