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 ...

And 64 million years after dinosaurs went extinct, modern humans emerged in the Cenozoic era. The planet has seen an incredible series of changes—discover them for yourself.

Curious Kids is a series for children of ... With no food available for them, big plant-eating dinosaurs like Triceratops quickly went extinct. That left big predators like Tyrannosaurus rex ...