As plants bloom earlier due to rising temperatures, caribou are arriving at their calving grounds when the bounty is past its peak, leading to fewer births and a lower survival rate, researchers say.

Poisonous chemicals trapped for decades in ice are now seeping into the polar ecosystem via glacial meltwater, researchers report.

See a supercell light up the Texas sky, U.S. Marines braving a sandstorm in Afghanistan, the Olympic torch reach the top of Mount Everest, and more.

Watch young chimpanzees beat Japanese college students in a short-term-memory test by a wide margin—raising questions about primate intelligence and evolution.

The world's largest group of orangutans in Indonesia may face extinction by 2011 because of palm oil plantation expansion, which is destroying habitat, experts say.

Great tits are timing their egg laying to coincide with an earlier emergence of caterpillars in England, a decades-long study has found.

Thousands of horses, cows, and other livestock face a possibly toxic brew of deep ash and gases. And the region's all-important farms may be devastated for decades.

Eight Amur leopards—the world's rarest big cats—were recently photographed in far southeastern Russia, giving renewed hope to conservationists.

The genome of the platypus—our most distant mammal relative—has been decoded, revealing traces of mammals' evolutionary break from reptiles hundreds of millions of years ago.

A six-month-old whale found dead on a New Zealand coastline is giving scientists a rare peek into the anatomy of the bizarre creature.

After 9,000 years Chaiten volcano has exploded back to life, forcing people to flee its southern Chile region.

Wildlife officials in the Cayman Islands are struggling to determine who killed six extremely rare blue iguanas recently found butchered in a nature preserve.

Debate has heated up over a controversial theory that suggests huge comet impacts wiped out North America's large mammals nearly 13,000 years ago.

Shot through the beak, Beauty the bald eagle currently has to be hand fed. But she'll soon be surgically fitted with a nylon-composite beak.

The U.S. trails only China in sales of worked ivory pieces, in part because of legal loopholes, lax enforcement, and the ease of arranging deliveries online, a new report claims.