An artistic rendering of a plesiosaur, an ancient marine predator that lived over 150 million years ago. (The Perot Museum of Nature and S) Although plesiosaurs evolved from land-dwelling animals ...

The bones, it turned out, had belonged to a plesiosaur, a fearsome marine reptile that prowled the seas covering most of Texas about 150 million years ago. The fossilized remains have since been ...

The happy event Think less sea monsters, more doting parents: the long-necked plesiosaurs that roamed the seas during the dinosaur era gave birth to live young. They probably cared for their ...

In the case of a 161- to 155-million-year-old plesiosaur recently discovered in Wyoming, the marine reptile died with its last meal preserved in its stomach.