This book is all about dinosaur's and how they came how to recognize them and different types of dinosaur's. Dinosaurs were believed to be an early Proterosuchus then they kind of formed from that. There were many different types of dinosaurs from some smaller then a chicken to some where the tower over trees. There were meat eaters and plant eaters so many different kinds it is hard to count. A lot of things I didn't know about dinosaurs, they are so interesting but not my call in life to study dinosaurs. I did not like this book because it was really boring for me but if you really like dinosaurs then this is the book for you.