Human ancestors got steadily larger over the last 1 million years. Our relatives living in colder places developed bigger bodies, a new study finds.

The side-by-side tracks of two ancient animals have been called "by far the oldest vertebrate tracks in Grand Canyon."

A new study reveals there were multiple species of Deinosuchus, the giant crocodylians that lived 75 million years ago. They were among the largest predators in the ecosystem and ate dinosaurs.