An interview with "Born Free" star and lion activist Virginia McKenna.

The lives of Joy and George Adamson, the couple who adopted the famous lioness, Elsa.

How did the Born Free story change you?

Scientists are struggling to understand why frogs are dying all over the world. But everyone can be a part of the solution. Here are some ways you can help.

Black skin, blubber, and a coat of clear tubes. Facts and stats to better know a polar bear.

Delayed implantation, hibernation, and everything else you'd want to know about Ursus arctos.

A practical guide to billfish, a group of predatory fish that includes marlin, swordfish, sailfish and spearfish that are best known for their prominent bills.

Another fantastic season of NATURE has come and gone. What wins Best in Show? You tell us. Vote for your favorite episode from Season 30.

The couple answer your questions about their time in the Frank Church-River of No Return Wilderness, wolf sightings, and the making of the PBS Nature film.