Acristavus does not have a crest. The top of its skull is flat. Brachylophosaurus has a large, flat, paddle-shaped crest that completely covers the back of the top of its skull, it is a perfect example of evolution within a single lineage of dinosaurs over millions of years.

Freedman Fowler

Categorized in : Science

We think that the crests of dinosaurs were visual signals so that they could recognize members of their own species, and also tell whether the animal was mature or not.

Freedman Fowler