Growing up Triceratops

By Thea Breite, Daniel Conover, Jaime Gonzales, Greg Gross

Published Mar 21, 2006

With its three horns and boney frill, triceratops were easy to spot. But what were the horns for? How early did they begin to grow? No one knew, because no one had ever seen a baby triceratops' skull.

That changed nine years ago. Today, a little fossil is challenging some big ideas. 

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