Using side-by-side comparisons between very similar dinosaurs, fans of the prehistoric can see the myriad differences and similarities between the selected species. Prehistoric biodiversity within related groups is something not often focused on for younger audiences, but it is done really well in these titles. Taking them species by species and connecting them to their evolutionary relations also ties in ideas from biology class for living species. VERDICT Dinosaurs lived all over the world during their heyday, and these titles are a great introduction to the various related and diverse species that once roamed the Earth.