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	Going For Height Brachiosaurus was one of the tallest dinosaurs and had a neck that stretched up from high shoulders. It could reach up to 11.8 metres. It may have fed on the tops of trees, like a giraffe.   Previous: Back Book: Prehistoric Life Section: Prehistoric Chapter: Biggest Dinosaurs