Prehistoric mammals are groups of mammals that lived before humans developed writing. 164 million years ago, in the Jurassic period, Castorocauda lutrasimilis, a mammal-like (mammaliaform) animal weighing about 500 grams (1.1 lb), had a full mammalian pelt, with guard hairs and under fur, webbed feet, and scales on the tail like a modern beaver, as well as teeth specialized for catching fish.

Later, about 130 million years ago in the Cretaceous, there existed larger mammals, including Repenomamus giganticus and Repenomamus robustus. Fossils up to one meter (3¼ ft) long have been found, with dinosaur remains in their stomach contents.

The lineages of many varieties continued through the Tertiary period where some reached very large sizes. Most of the very large mammals became extinct in the last ice age, but have smaller descendants.

[edit] List of prehistoric mammals

Prehistoric mammals include:

Amebelodon American Cheetah American Camel American Lion American Zebra Anancus Ancient Bison Ancient Narwhal Andrewsarchus Archaeobelodon Arsinoitherium Aztlan Rabbit Barytherium Basilosaurus Beringian cave lion Bone-crushing Dog Brontotherium Castorocauda lutrasimilis[1] Cave Bear Cave Lion Chalicothere Chalicotherium Deinotherium Diminutive Pronghorn Diprotodons Dire Wolf Doedicurus Dorudon Dwarf elephant Dwarf killer whale Dwarf Polar Bear Elasmotherium Embolotherium Entelodont Eobasileus European Jaguar European Gorilla European Hippopotamus Four-Tusked Elephant Giant Orangutan Giant Koala Giant Meerkat Giant Long-horned Buffalo Giant Lynx Giant Vampire Bat Giant Beaver Giant Killer Whale Giraffe Camel Glyptodon Gomphotherium Hypselephas Hyracotherium Indricotherium/Baluchitherium/Paraceratherium Irish Elk Kennalestes Knife-flippered Killer Whale Japanese Dwarf Elephant Harrison's Whale Horned Narhwal Hyaenodon Humpback Narhwal Japanese Cougar Juxia Macrauchenia

Mammoths Columbian Mammoth Woolly Mammoth Pygmy Mammoth Imperial Mammoth Tundra Mammoth Wrangel Island Mammoth Malagasy River Dolphin Marsupial Lion Mastodons American Mastodon Palaeomastodon Sinomastodon Megaloceros Megalocnus Megatherium Meninatherium Menodus Metamynodon Moeritherium North American Camel North American Llama Raccoon Panda Paratetralophodon Phiomia Platybelodon Primelephas Propalaeotherium Purgatorius Pygmy Polar Bear Pygmy Giant Panda Powerful Killer Whale Repenomamus giganticus and r.robustus[2] Rhynchotherium Rinston's Bottlenose Dolphin Saber-toothed cats Smilodon Samotherium Sivatherium Shark-toothed Dolphin Short-faced Skunk Short-faced Anteater Shuler's Pronghorn Stegodon Stubby-Tusked Narwhal Sensitive Ibex Swan-necked Seal Synthetoceras Teleoceras Tetrabelodon Tetralophodon Thylacosmilus Toxodon Trilophodon Uintatherium Walrus Whale Wilmington's Ground Sloth Wanda's Fox Woolly Rhinoceros Zygolophodon

[edit] See also

• Synapsid
• Therapsid
• Cynodont
• Mammaliaformes
• List of extinct mammals
• Megamammals
• Pleistocene extinctions
• Pleistocene megafauna

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