Book excerpt: A fun introduction to prehistoric creatures that are not dinosaurs, and why! Everyone knows what a dinosaur is, right? Well, maybe not. Dinosaurs are actually just one type of extinct animal from prehistoric times. So, what sets them apart? Here, readers are introduced to ten prehistoric animals. Each one looks like a dinosaur. But it's missing at least one key characteristic of all true dinosaurs. Animal by animal, each of those characteristics is added to a growing list, until, by the end of the book, readers know just what makes a dinosaur a dinosaur! A dinosaur by any other name is... not a dinosaur, of course!