Table of Contents Introduction to Dinosaurs Facts about Dinosaurs Dinosaur Extinction Dinosaur Fossils Dinosaur Eggs What Dinosaurs Ate Feathered Dinosaurs Plant Eating Dinosaurs The Weirdest Dinosaurs The Deadliest Dinosaurs Flying Dinosaurs Kinds of Dinosaurs The Biggest Dinosaurs The Smallest Dinosaurs Conclusion Publisher Introduction to Dinosaurs The word dinosaur comes from the ancient Greek word, denios, which means terrible lizard. Dinosaurs ruled the Earth 65 to 225 million years ago.