Though small enough to fit in your hand, a prehistoric animal has been long been seen as proof that apes and humans arose in Africa. But a new study says the creature wasn't an ape ancestor, after all—though it may be a red herring.

A cold snap that killed off much of North America's wildlife and early humans about 13,000 years ago was not caused by a comet impact as previously suggested, scientists say.

Weighing in at fewer than two pounds, the Chihuahua-size dinosaur Fruitadens haagarorum was an agile omnivore, a new study says.

What may be "the largest crater known on Earth" could be proof that the dinosaurs' demise was due to two giant space rocks that struck in Mexico and India, scientists say.

A newfound fossil predator, which may have hunted other flyers, is a hodgepodge of older and more modern flying reptiles, scientists say, bridging a gap in pterosaur evolution.

If the largest snake that ever lived were still slithering today, it would feel right at home in South America's rain forests, newfound fossils from the snake's ancient home reveal.

Young dinosaurs weren't Mini-Me versions of their parents, new evidence suggests—meaning that up to a third of dinosaur species may be misidentified.

Bigger and badder than the deadly Komodo dragon, a mysterious prehistoric lizard may be a new species, say scientists piecing together the Australian origins of reptilian giants.

Acid rain created by a volcanic eruption caused a devastating mass extinction, leaving the planet teeming with wood-eating fungi, a new study says.

See Bluestonehenge, the newly discovered site that archaeologists say was likely a key stop on the journey to the afterworld—and to Stonehenge itself—for many Stone Age Britons.

A sleek, "ballerina like" cousin of Tyrannosaurus rex has been unearthed in the Gobi desert, a find that reveals fearsome "tyrant lizards" were more diverse than thought.

The newfound "Bluestonehenge" stone circle may have been a ritual pit stop on the road to Stonehenge—and the afterlife.

See the latest, four-winged evidence that birds are dinosaurs in disguise, the guts of Nero's rotating dining room, a new Hubble stunner, and more.

Why don't women know when they're ovulating? Why don't men have clacker-sized testicles? The world's oldest known "human" skeleton—"Ardi"—may hold clues.

There was never a chimp-like missing link between humans and today's apes, says a new fossil-skeleton study that could rewrite evolutionary theory. Said one scientist, "It changes everything."