That's because polar bear fur is transparent and hollow.When light strikes the outer fur some of it is absorbed while the rest is scattered away. The result? The fur can appear as different colors ...

GRANDDAD: One day, a brown bear was born that had lighter fur, almost white - so when he crept up on a seal… SAM: The seal didn't see him coming. LIGHT-FURRED BEAR: Rarr! GRANDDAD: And after a ...