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 ...

Triceratops was one of the most common dinosaurs at the end of the Cretaceous Period. Its most prominent features are on its head: two long brow horns, a nasal horn, and a bony frill. Its frill had no ...

The number of dinosaurs may have been stable before the asteroid impact, despite evidence that species were getting less diverse ...

Image credit: (above) Struthiomimus and Triceratops, Douglas Henderson, pastel on paper, 1999. From the children's book, Asteroid Impact, 2000.