All teeth evolved from a single ancient sea predator, according to a new study. The study explains how certain species evolved to grow teeth by pinpointing their likely origin in an armored ray that ...

Scientists off the coast of the United Kingdom added some bait to an underwater camera device, dropped it off the side of their research vessel and waited. Down below, a curious predator with ...

A rare predator was recently found dead in the northern Arkansas wilderness, raising questions about where it came from and what killed it. The animal, a mountain lion, was spotted in the Sylamore ...

The ancient seas of the Late Cretaceous period would’ve been scary places to swim. Between 66 million and 100 million years ago, the world’s waterways were chock-full of real-life sea monsters. Not ...

With two massive canines, an L-shaped jaw, and a pouch to carry its young, the saber-toothed marsupial Thylacosmilus atrox sounds like an evolutionary Madlib. But researchers have now described an ...

The first true mammals evolved roughly 200 million years ago, during the early days of the dinosaurs. But mammals are the last surviving members of an older group, called the therapsids. At first ...