Horned

 Certain herbivore dinosaurs had their own evolutionary defenses- armored bodies.

This included the panaplosaurus, a walking tank.

This is the fossilized skull of one.

We start getting into the various horned dinosaurs now.

Leptoceratops was a member of the horned dinosaurs, but without the horns, living at the same time as its cousins. A case with fossils of one such dinosaur is contained above this panel.

Here we have the dinosaur most of us think of first- triceratops. 

There were others, such as chasmosaurus, each with differing looks, but similarities too.

I leave off here. Tomorrow we finish up this series.