My daughter loves dinosaurs, so we got her this to help her learn more about dinosaurs, their names, the time periods they lived in, etc. Since this book calls itself an encyclopedia, I assumed that this basic information would be present. I also assumed that the information would be presented in an organized, logical way. I was wrong on both counts. The book is a fairy interesting picture book about dinosaurs and other prehistoric animals, and it gives a basic outline of the timeline of the animals. It gives very little else in the way of useful information. There are pictures of dinosaurs that are unlabelled, so when my daughter says, "What kind is that?" I have to say that I don't know. Very little information is given about the dinosaurs, and nearly all of it is about groups of dinosaurs (sauropods, etc.) rather than individual ones. I was very disappointed with this book; it if calls itself an encyclopedia, it should be arranged like one.