Earth was a lot different when dinosaurs were alive. Scientists study important clues that were left behind to learn what kinds of dinosaurs lived where, what they ate, and how fast they could run. Even though there have been incredible changes on Earth, there are still dinosaur relatives living today! Features include comprehension questions, educational front/back matter, full-color illustrations, full-color photographs, glossary of key words, index, note to parents and educators, and table of contents.