Polar bears are living on borrowed time. Did you know they are descended from grizzlies? I didn't. They evolved to live and hunt on the frozen Arctic ice, eating a specialized diet of seal meat.
But the winters are increasingly warmer, the ice is disappearing and raising a family has become a more difficult proposition.
As always, Nature offers astounding production values, and frankly when it comes to the "cute" factor, you can't beat baby polar bears!
For a video preview visit http://www.pbs.org/wnet/nature/arcticbears/index.html
On another note, thanks to all who have entered my One World, One Heart drawing! I'll be picking tomorrow and in touch with the winner!