Earth once hosted more than 10,000 species of these ancient marine predators. Find out how they lived, when they vanished, ...

What paleontologists learned from fossils of a 3-eyed predator that lived 500 million years ago The unique features of Mosura fentoni astounded paleontologists.

You might call it the "swamp thing." About 280 million years ago, a large creature built somewhat like a salamander but with frightful fangs prowled the swamps and lakes of what is now Namibia ...