An artist's impression of Mesozoic animals found fossilized in the Kayenta rock formation. It depicts Dilophosaurus (dinosaur) at the back, Kayentatherium (Mesozoic mammal) in the center, and Kayentachelys (Mesozoic turtle) at the front. Mark Witton
Animals

Mammals Emerged From the Shadows When Dinosaurs Went Extinct

When dinosaurs died out, many mammals evolved from being nocturnal to diurnal, and the primate ancestors of humans were among the first to do so.

Updated On 11/06/2017 at 10:53AM EST
4:51 PM EST
Recreation of dinosaur extinction at the Deccan Traps in Western Ghats, India | Zina Deretsky, National Science Foundation, Wikimedia Commons
Recreation of Tyrannosaurus rex | pixabay