Their fur isn't white, but transparent. The hollow hairs inside reflect light, giving it a white appearance.
Underneath their fur, polar bears have black skin, which absorbs heat from the sun.
Their noses are so sensitive they can smell a seal from over a mile away.
Polar bears are excellent swimmers and can stay underwater for up to 2 minutes.
Their large paws help them distribute their weight on the ice and snow.
They don't hibernate, but they can go into a state of torpor during the winter when food is scarce.
Climate change is a major threat to polar bears as it affects their habitat and food sources.