How do polar bears stay warm in freezing conditions?

Polar bears stay warm in freezing conditions thanks to their thick fur and a dense layer of insulating fat. Their fur consists of a waterproof outer layer and a dense undercoat that traps air, providing insulation. Beneath their skin, a thick layer of blubber helps retain heat and provides energy reserves. Their black skin absorbs heat from the Sun, while their small ears and tails minimise heat loss, allowing them to thrive in Arctic environments.