Scientists still debate the purpose of this dinosaur's iconic horns and spiky head plate. Find out what we’ve learned about how Triceratops lived and why it went extinct. Triceratops’ enormous ...

Mark Norell, the museum's chairman of paleontology, shares some surprising facts about the biggest known dinosaur yet. Photo: American Museum of Natural History.

Pachycephalosaurus wyomingensis was the largest of the pachycephalosaurids—"thick-headed dinosaurs"—which featured extremely thick skullcaps. The top of a Pachycephalosaurus skull could be 9 ...

Looking for more dinosaur fun? Sing - Learn facts and have fun as you sing and dance to the tyrannosaurus rex, stegosaurus, diplodocus and even more dinosaur raps.