Fossil footprints in what is now South Korea are evidence that some species of ancient crocodiles walked on two feet.

The trajectory of the Chicxulub asteroid led to the most efficient release of gas and projectile rocks – which was disastrous for life on Earth.

Smaller dinosaurs needed speed, but huge predators like Tyrannosaurus rex relied less on moving fast and more on energy-efficient walking.

Fossils from Spinosaurus aegyptiacus may be "smoking gun" evidence it lived in the water. That could upend the idea that there were no swimming dinosaurs.

New paper argues the Spinosaurus was aquatic, and powered by predatory tail.

A newly discovered dinosaur called Dineobellator notohesperus was one of the last species of raptor. It also had feathers, researchers say.

Research with a baby duckbilled dinosaur "adds to the growing body of evidence that these tissues, cells, and nuclear material can persist for millions—even tens of millions—of years."