A cast of the only baby triceratops skull ever found shows that the animal developed its horns at a young age - a big surprise to dinosaur experts.

If triceratops babies were born with horns, then what were the horns used for? Fighting? Signaling? Or something else?

With its three horns and boney frill, triceratops was 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, this little fossil is challenging some big ideas.
When did dinosaurs live? What were they? How do we learn about them?
Scientist Mark Goodwin talks about what this prehistoric baby is teaching us.
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