Prehistoric Life Prehistoric Secrets in Stone The Earliest Fossils The Silurian Reef Trilobites Fish The Coal Forests Early Reptiles and Amphibians Sea Reptiles Flying Reptiles The Teeming Seas Hunting Dinosaurs Biggest Dinosaurs Two-Footed Plant Eaters Plated and Armoured Dinosaurs Horned Dinosaurs The Mammal Age Dawns Grassland Mammals The Ice Age	Tyrannosaurus Tyrannosaurus was probably the biggest meat-eating dinosaur. It had a huge head and the great jaws held teeth up to 15cm long. These 'tyrant kings' walked upright on powerful legs. Their arms were tiny, however.   Previous: Back Book: Prehistoric Life Section: Prehistoric Chapter: Hunting Dinosaurs