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

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 ...

That resident was, of course, the fossil skull of a Triceratops dinosaur that had sat on display at the University of Colorado Museum of Natural History for decades. In May, a team from the ...