This is an identification guide to the most important and best known dinosaurs. Do you know the difference between a Coelophysis and a Diplodocus? How much larger than a human was a Spinosarus? Is it likely that the Parasaurolophus made a sound like a trombone? All these questions and many more are answered in "Collins Gem Dinosaurs", a highly illustrated guide to the world's very wild life hundreds of millions of years ago. A fully illustrated guide to the lost world of dinosaurs, the book provides descriptions of the most significant features and habits of these fascinating prehistoric reptiles, with profiles of nearly 70 dinosaurs, which include in-depth looks at how dinosaurs lived, from keeping warm to moving about. For each species information is given on: what they ate; how their size compares to ours; how they behaved; and where they lived. The book also includes explanations of what the dinosaur names mean and how to pronounce them.