Prehistoric mammalprehistoric mammals, prehistoric mammal toys
Prehistoric mammals are groups of mammals that became extinct before humans developed writing 164 million years ago, in the Jurassic period, Castorocauda lutrasimilis, a mammaliaform mammal-shaped animal weighing about 500 grams 11 lb, had a full mammalian pelt, with guard hairs and underfur, 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; a fossil of Repenomamus giganticus indicates that the animal was about 1 meter 3 1⁄4 ft long In the stomach of a smaller cousin, Repenomamus robustus at 52 cm 20 1⁄2 in, the remains of a juvenile dinosaur have been preserved
The lineages of many varieties continued through the Cenozoic era where some reached very large sizes Most of the very large mammals became extinct in the last ice age, but have smaller descendants
List of prehistoric mammalsMain article: List of prehistoric mammals
Prehistoric mammals include:
- List of extinct mammals
- Pleistocene extinctions
- Pleistocene megafauna
- ^ "Life" New Scientist Retrieved 6 April 2018
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