Protoceratops andrewsi

Protoceratops might have weighed as much as 225 kilograms (500 pounds)! By studying its teeth, paleontologists know that it was an herbivore (plant-eater). In the 1920s, the first Protoceratops fossils were discovered in Central Asia. Some were found preserved trying to dig their way out of collapsed dunes.

Image credits: main image, Rick Spears; story image, © AMNH; Protoceratops skull, © AMNH; quote, courtesy of Pete Makovicky.