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The age of the dinosaurs ended 66 million years ago, when an asteroid six miles in diameter crashed into what is now southeastern Mexico. The world went up in flames. Dinosaurs, along with the massive reptiles that ruled the sea and the sky, perished as forest fires raged across the globe, dust blotted out the sun, and Earth experienced intense heat, frigid cooling, and then more heat. Conventional wisdom states that mammalian diversity emerged from the ashes of the mass extinction, ultimately giving rise to our own humble species. But according to a study in the Journal of Evolutionary Biology,...

WASHINGTON (AFP) – Meat-eating dinosaurs the size of a small chicken roamed areas of North America 75 million years ago, according to research by Canadian paleontologists. The mini-dinosaur, similar in appearance to the Velociraptor, is named Hesperonychus elizabethae and is the smallest carnivorous dinosaur known to have lived in North America. "Hesperonychus is currently the smallest dinosaur known from North America," said University of Calgary paleontologist Nick Longrich. "Its discovery just emphasizes how little we actually know, and it raises the possibility that there are even smaller ones out there." Longrich, together with University of Alberta paleontologist Philip Currie, are...