dinosaurs

Scientists drilling beneath the Gulf of Mexico have hit the layer deposited when an asteroid the size of Staten Island, N.Y., hit Earth. Samples might contain details from that fateful day.

A nearly complete fossilized skull from Argentina helps explains the success of these giant dinosaurs that roamed some 95 million years ago.

Drills and screws would damage the frail, 65.5 million-year-old bones of the Smithsonian's 38-foot-long Tyrannosaurus rex. So how do you make it stand? Blacksmiths in Canada are working their magic.

The ribs of a 240 million-year-old fossil hold clues to how the first turtle shell evolved. And its skull shape seems closer to that of lizards and snakes than to an ancestor of dinosaurs and birds.

Don Lessem was the dinosaur adviser for the first Jurassic Park, a job he says sounds more impressive than it was. His real big-dinosaur break happened years later, thanks to a blurry photo of a bone.

Hoping to help trace the history of how velociraptors evolved into birds, researchers at Harvard and Yale may have tracked a key beak transformation to two genes.