A Japanese aquarium's "ray of hope"—the first giant manta ray ever born in captivity—has died after just four days.

See the biggest winners and losers from this month's UN convention on the wildlife trade, which affected animals that appear on menus, in medicines, and in marketplaces worldwide.

Watching razor-equipped roosters slash each other to death is still legal in Louisiana, but the U.S. state looks likely to join all 49 others in banning the practice.

The calf that had dolphin "talk" played to him while in the womb died June 15 after what had appeared to be a healthy birth.

A giant beaked dinosaur found recently in China probably represents the largest feathered animal ever known, say fossil hunters.

Photo Gallery: Giant Birdlike Dino >>

Fossilized in a southern quarry, the dinosaur-era reptile had grasping feet, suggesting a tree-to-tree lifestyle, a new study says.

Aerial pictures reveal vast herds of antelope, elephants, and ostriches flourishing in Southern Sudan, despite decades of war.

A two-month-old gorilla is in critical condition after its mother was shot in the back of the head in eastern Congo, where rebel groups have repeatedly been accused of eating the critically endangered apes.

See the first footage in 25 years of what may be the world's largest land migration—the annual trek of up to a million white-eared kob.

Staggering numbers of elephants, gazelle, and ostriches, plus at least 800,000 white-eared kob, thrived during 25 years of civil war in Southern Sudan. But others didn't fare so well, a new survey shows.

Larger dinos were more sensitive to booms and thuds than squeaks and whistles, according to new research that finds links between body size and hearing.

This week: A wine-soaked bull stampedes in Portugal, an owl interrupts Finnish soccer, London's whales get a spring cleaning, and more.

Whether as crew pets or stowaways, the few penguins ever spotted in North American waters likely arrived as passengers on fishing boats, a new study concludes.

Something fishy is going on with the gray whales that aboriginal Russians depend on for food. The whale meat carries a stench that makes it inedible.

A new creation from the special-effects experts at Weta Workshops is helping researchers understand the territorial behaviors of a rare island reptile.