Add Yahoo as a preferred source to see more of our stories on Google. A rare fossil of Joaquinraptor casali from Patagonia reveals a powerful predator that may have dined on crocodiles. (CREDIT: The ...

Researchers discovered that a 215-million-year-old reptile started life on four legs and switched to two as an adult.

In biology and palaeontology (the study of extinct organisms) there are a few ways to estimate the age of an animal’s skeleton. One is the extent of fusion of sutures in the skeleton – how much the ...

Until now, estimating how old a dinosaur was when it died has been a fairly simple process — just count up the growth rings in its fossilized bones. "We always thought that those rings were formed ...

A fossil from the blustery plains of Patagonia is revising your book on one of the most elusive bands of hunting dinosaurs. The newly discovered dinosaur, Joaquinraptor casali, preyed on the soggy ...