A team of biologists proposes introducing lions, elephants, and other wild animals to replace the giant Ice Age mammals that roamed the U.S. Plains.

On his seven-month flyover of Africa, conservationist J. Michael Fay saw hundreds of hippos stuck in mud, vast anteloope herds, and humans nearly everywhere.

In June 2004 conservationist J. Michael Fay and pilot Peter Ragg departed a South African airstrip in a camera-laden Cessna 182, launching one of the most remarkable expeditions in the history of Africa.

Thousands of digital images shot from a low-flying airplane have revealed a startling new portrait of Africa.

Animal rights activists have embroiled Australian wool growers in a media campaign over how to protect sheep from flystrike, a slow death wrought by maggots.

Two years ago activist Timothy Treadwell was mauled to death by a bear he considered a brother. Was he to blame for his own killing?

Rising temperatures are rapidly changing they way animals mate, feed, and migrate, researchers say, and creatures that can't adapt may not survive.

Boomer the kangaroo is making himself at home in a 127-year-old Australian inn.

Inca bureaucrats used mop-like knotted strings called khipu as "documents" in a sophisticated accounting system, new research reveals.

Ancient hunters, not climate change, may have spurred the extinction of giant sloths, saber-toothed cats, and other Ice Age mammals, a new study says.

Two new lemur species—one a "good man" and one a squirrel-size "child"—have been found off Africa.

Thanks to a star turn in the movie Napoleon Dynamite, these half-lion, half-tiger hybrids are stealing the show at U.S. sanctuaries. With photo gallery.

Skeptics who questioned evidence that the "extinct" ivory-billed woodpecker had been rediscovered concede new audio recordings offer convincing proof that the bird is alive.

Female California fiddler crabs play seriously hard to get, according to a new study, which found that one bachelorette inspected 106 crab cribs before finding Mr. Right.

With the world nearly defenseless against a possible bird flu pandemic, a new study evaluates ways of containing an outbreak.