Using stinging tentacles and wide mouths, large coral polyps in the Red Sea have, for the first time, been discovered eating jellyfish nearly as big as they are.

Five ancient crocodile ancestors, two previously unknown, have been uncovered in the Sahara by a National Geographic researcher and his team. The most imposing, BoarCroc, was 20 feet long with triple fangs and likely could have taken down a dinosaur.

Fossils of five "oddball" crocodilian ancestors found in the Sahara suggest that the bizarre beasts ruled the southern landmass of Gondwana about a hundred million years ago, paleontologists say.

A "saber-toothed cat in armor" and a pancake-shaped predator are among five strange, dinosaur-era crocodile cousins discovered in the Sahara, archaeologists say. Meet BoarCroc, PancakeCroc, DuckCroc, RatCroc, and DogCroc.

Uncovering another link between chimpanzees and humans, a new study found chimps gesture mainly with their right hands. This indicates the chimp brain's left side is used in communication, as in people.Video

"I'd be shocked if no life existed on Europa," one scientist says—and provocative new research suggests the moon's seas have enough oxygen for fishlike animals.

What could be the only footage of an actual human headshrinking ceremony in South America--which shows heads being boiled and dried--may be real, says an explorer in a new documentary. Warning: Video contains graphic images.

2009 is nearly over, and if you believe in Friday the 13th superstitions, that's a good thing—this year packs the most Friday the 13ths possible. Find out why 2009 is ominously overpacked and where those superstitions came from.

By tweaking a single gene, scientists have made Hobbie-J the smartest rat in the world. The technique might make humans smarter too—maybe too smart.

Solving a longstanding puzzle among bird experts, scientists have found that the sharp, violin-like sounds of a South American songbird come not from the beak but from a suite of specially evolved, vibrating feathers. With video.

Male club-winged manakins vibrate their wings to create violin-like sounds to impress females, a new study says. Video.

Its skin pale and rubbery and its organs swollen with gas, an "alien" discovered in a Panama creek has now been identified by veterinarians as a common three-toed sloth.

Asteroids slamming into Earth, a planet sneaking up on us, an angry sun singing the planet—find out why these and other end-of-the-world events won't be happening in 2012.

Supposed Maya predictions of the end of the world in 2012 have some people seriously scared. See what experts say about the unknown planet predicted to pummel Earth, the cataclysmic "galactic alignment," and more.

Just as some people today believe a Maya calendar pinpoints 2012 as the end of the world as we know it, people through centuries and across cultures have long forecast our collective doom.