The six-inch, three-month-old titi monkey was stolen from the La Plata zoo, which was filled with 4,000 visitors at the time.

More than a hundred gharials found dead since December in an Indian river sanctuary likely died after eating fish carrying industrial chemicals, officials announced.

Mobs of kangaroos near Canberra are overgrazing land and threatening endangered species, prompting a new government plan to cull the animals, authorities say.

Feared extinct in parts of West Africa, the mysterious pygmy hippopotamus has recently been photographed in the war-ravaged forests of Liberia.

The seven tiny feathers could fill a key gap in the puzzle of how dinosaurs gave rise to flying birds, a new study says.

Three conservation groups filed a lawsuit Monday over the government's delay in deciding if polar bears should be listed as threatened under the Endangered Species Act.

Did Japanese guards shoot "bullets" or toss "warning balls" at activists throwing "stink bombs" at whalers in the Antarctic Ocean? Accounts of the incident conflict.

See the earliest known photo of Helen Keller and Anne Sullivan, Uncle Sam in a sad state, a groundbreaking space image, and more.

Pollution drifting up from populated areas threatens polar bears in their formerly pristine Arctic habitat, according to Norwegian researchers.

"I had heard about this whale, but we had never been able to find it," said a scientist who saw the giant mammal off Alaska's Aleutian Islands.

A massage therapist in India claims she can relieve the stress of overworked elephants through massage.

The Kashmir city of Srinagar is using strychnine to poison the dogs. It's part of an anti-rabies effort that local animal rights activists oppose.

Experts say the new finds add a wrinkle to the debate about bat evolution, adding that the animals were probably as "obnoxious and loud" as their modern-day descendants.

Antarctic cod are the first fish known to actively reduce their feeding and drop their heart rates during the long winter months, a new study shows.

The third such flood in 12 years aims to redistribute sediment and help restore the ecosystem that was changed when the Glen Canyon Dam was built in 1963.