A new dam in Laos might spell doom for the Mekong giant catfish, the world's largest freshwater fish, experts say.

Dangling high above San Francisco Bay, high-altitude activists turned the Golden Gate Bridge into an anti-China billboard. The Olympic torch is set to arrive Wednesday.

Colonies of short-snouted seahorses have been doing swimmingly in London's newly restored river, conservationists announced today.

See a striking image of blood on ice, the Golden Gate gone dark, a "young" supernova, a robotic ship on the edge of space, and more.

Wild octopuses engage in "jealous murders," gender bending, and once-in-a-lifetime sex, unlike their seemingly shy, unromantic captive brethren, a new study says.

It has a face like a plate and eyes like a human's. And it may signal a whole new family of fishes, one expert suggests.

See photos from the April Fools' Day parody, including Paris Hilton gone wild. Though National Geographic helped with design, the magazine had no part in the satire's content.

Scientists have unearthed a pristinely preserved statue of Queen Tiye—the favorite wife of pharaoh Amenhotep III—in ancient Egypt's largest funerary complex.

Giant sea spiders, spine-crushing daggertooth fish, and pink "sea pigs" are just a sampling of exotic creatures hauled up by scientists during a recent Antarctic expedition.

See a giant squid glossily preserved, the world's tallest man getting a break, northern lights glowing green over the Arctic, and more.

A suspicious package in the bus's cargo hold turned out to contain a massive lower jawbone that likely belonged to an elephant-like animal.

For an odd-looking, big-nosed antelope on the steppes of Central Asia, the threat of extinction is just a whiff away, scientists say.

The ten-foot-long (three-meter-long) reptile likely came to dominate the seas as larger marine animals went extinct 62 million years ago, scientists announced.

The new genus of dinosaur-era, carnivorous reptile, found deep in a Canadian mine, is also one of the most complete fossils of its kind ever unearthed.

New satellite images reveal the "runaway" collapse of an ice shelf seven times the size of Manhattan.