Prehistoric Life
By Bob Strauss, About.com Guide to Dinosaurs
Dinosaurs weren't the only creatures that roamed the earth tens of millions of years ago. Here are profiles and descriptions of other ancient animals, including the ancestors of modern horses, cats and dogs--as well as the aquatic and avian reptiles that lives alongside the dinosaurs.
A-Z Profiles of Prehistoric Life

Complete, alphabetical profiles of prehistoric animals, including avian and aquatic reptiles and ancient mammals.
- An A-Z List of Aquatic Reptiles
- An A-Z List of Avian Reptiles
- An A-Z List of Terrestrial (Non-Dinosaur) Reptiles
- An A-Z List of Prehistoric Mammals
Prehistoric Reptiles

Information about the ancient reptiles that lived alongside (or before) the dinosaurs--including pterosaurs, ichthyosaurs, pliosaurs and plesiosaurs, and the "mammal-like reptiles."
- Pterosaurs - The Flying Reptiles
- Ichthyosaurs - The "Fish Lizards"
- Plesiosaurs and Pliosaurs - The "Sea Serpents"
- Before the Dinosaurs - Pelycosaurs, Archosaurs and Therapsids
- Crocodiles - The Ancient Cousins of the Dinosaurs
Prehistoric Mammals

Information about the ancient mammals that lived alongside, and then succeeded, the dinosaurs--including primitive horses, cats and elephants, as well as the tiny mammals of the Mesozoic Era.
- The First Mammals - Mammals of the Triassic, Jurassic and Cretaceous Periods
- Saber-Toothed Cats - The "Tigers" of the Prehistoric Plains
- Prehistoric Proboscids - Mammoths, Mastodons, and Early Elephants
- Prehistoric Horses - The Story of Equine Evolution
- Prehistoric Whales - The Story of Cetacean Evolution

