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	Ultrasaurus There is no full skeleton of Ultrasaurus, but there are models of its leg bones. Ultrasaurus was even bigger than Brachiosaurus.   Previous: Back Book: Prehistoric Life Section: Prehistoric Chapter: Biggest Dinosaurs