The earliest mammal identified so far is from about 45 million years ago, but we are more familiar with the ones from 10,000 to 70,000 years ago. These co-existed with the first humans, and are better known because of cave paintings, mummified carcasses, tools made from bones, and other remains.
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- Ashfall Animals Describes a 10 million year old volcanic ash deposit in Nebraska which contains the remains of rhinos, camels, horses and other mammals which once lived in the area.
- Paleocene Mammals of the World A detailed and illustrated guide to the first 10 million years of their evolution.
- Utah's Ice Age Animals Describes the discovery of the remains of a sabre-toothed cat, mammoths, and a short-faced bear.
- Ice Age Mammals Looks at some of the mammals that lived during the last ice age, with pictures of what they might have looked like.
- Wikipedia: Glyptodon History and anatomy of this huge armadillo-like mammal.