Learn more about Dinosaurs with Archie the Archaeopteryx and Doni the Tyrannosaurus Rex! Doni and his friends live in a Dinosaur-zoo, and when the visitors are away the Dinosaurs come out to play! All the while Doni tries to learn, his brother Bluth seeks to pester him and bully his friends. In this book, Archie learns what a T-rex is, and wonders.are they hunters, or scavengers?.