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
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Dimetrodon
Fossils of Dimetrodon show it had long spines sticking up from its backbone. These must have supported a sail.
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 Early Reptiles and Amphibians