Polar bear fur is not actually white, but rather clear and hollow, the better to insulate them in icy waters and help them stay afloat. When exposed to the sun, these tubular hairs yellow slightly.

yellow, gray, orange, and even green. 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?

Now, researchers have discovered the bears have another unexpected Arctic adaptation: greasy fur. It’s a trait that, ...

Editor's Note: National Geographic went too far in drawing a definitive connection between climate change and a particular starving polar bear in the opening caption of our December 2017 video ...

New research finds grease that coats polar bear fur contains a specialized mixture of chemicals that make it resistant to ...

yellow, gray, orange, and even green. 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 de-icing properties of polar bear sebum could fuel new innovations, scientists say, potentially unlocking alternatives to harmful “forever chemicals” used in ice-resistant coatings today ...