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	Tracks Sometimes people find trace fossils of trilobites. These are the footprints and burrows left behind as they scuttled around.   Previous: Back Book: Prehistoric Life Section: Prehistoric Chapter: Trilobites