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.

An interactive map plotting the hatcheries and dams of the region.

An interview with Salmon: Running the Gauntlet filmmaker Jim Norton.

Here is a brief look at the lifecycle of one of the world’s most popular and most important fish.

Facts and stats about the members of the Salmonidae family.