The American river otter once inhabited waterways throughout the United States. Over time, a combination of the fur trade and habitat destruction have caused the otter's numbers to decline.

Yellowstone National Park is home to some of the most spectacular natural wonders of the world. It's also a haven for the river otter, star of the NATURE program Yellowstone Otters.

View the production credits for NATURE's "Orangutans: Just Hangin' On."

View additional resources, online and in print, for NATURE's "Orangutans: Just Hangin' On."

In 1994, Carel van Schaik of Duke University became the first anthropologist to document the use of tools among wild orangutans.

Like other primates, orangutans exhibit humanlike qualities -- from careful parenting to the use of tools. But how do their thought processes work?

Journey into the Asian rainforest to meet endangered apes.

NATURE takes you into the depths of the ocean to discover the most remarkable life still undiscovered on our planet that will certainly be found in the sea.

NATURE takes you into the depths of the ocean to discover the most remarkable life still undiscovered on our planet that will certainly be found in the sea.