The initial split was into synapsids (mammals and their relatives) and sauropsids (reptiles and birds). Mammals branched off from other amniotes very early. Several mammalian characteristics are ...

More mammals were living on the ground several million years before the mass extinction event that wiped out the dinosaurs, ...

The new research is the first to look back at early mammals in full color. Using advanced fossil imaging methods and a ...

"Our findings challenge conventional views on upper jaw evolution," the researchers said in a statement. Compared with our distant cousins the reptiles, the faces of mammals are made more complex ...

"Reptiles don't cut up their food," says ... All this done by the most intelligent of mammals. Evolution has given us this gift of intelligence, but are we too smart for our own good?

Mammals and birds have dramatically more neurons in their forebrain and cerebellum than reptiles, and neuron numbers have scaled up significantly only four times in more than 300 million years of ...

A newly described plesiosaur fossil from southern Germany is providing crucial evidence about the diversification of these ...

These changes separate the reptiles from the amphibians. #1, the evolution of stronger ... In the Osteichthyes through mammals, the skull is a fused unit in which the braincase is added to and welded ...

Only a handful of mammals can regrow teeth multiple times, compared to the 50,000 species of reptiles and fish. Take geckos, for example, who will replace all 100 teeth, or so, every 3 to 4 months.