Beyond T. rex
Some dinos have all the luck.Five Dinos You Know
But these popular dinosaurs tell only a small part of the story. Paleontologists have identified over 400 different species of extinct dinosaurs.

To see some strange and unusual dinosaurs you've never heard of (unless you're a paleontologist), play with the cladogram. A cladogram is like a family tree. It's a way of organizing dinosaurs based on the unique characteristics they share, like a three-toed foot or a hole in the hip socket.

How To Play
1. Roll over a dinosaur's name to see its picture.
2. Click the dinosaur name to see its Ology card.
3. Roll over a blue dot to discover how dinosaurs on a branch of this tree are related by what physical characteristics they share.