Researchers have identified various tracks made by tetrapods between 280 and 290 million years ago, which makes them the most ancient fossil footprints in Catalonia. They correspond to different ...

The three stages of mammalian backbone evolution are far clearer now, thanks to work by a team of researchers that examined fossilized backbones of primitive mammal ancestors and applied novel ...

Talk about vibrant nightlife. We thought the threat of predatory dinosaurs forced early mammals to become nocturnal. But it looks like their ancestors were night owls long before that. We can tell ...