The term megafauna refers to very large mammals that went extinct in the Cenozoic Era. This includes mammoths, saber tooths, giant beavers, giant ground sloths, and the American camel. These are just very few of the many animals this term covers. There are many theories as to how these animals went extinct. One theory is that the early humans overhunted these large animals. Other theories include climate changes, and killer viruses. It is hard to know, but we do know that 10,000 years ago, the megafauns, mostly massive animals, roamed much of North America, and then they were gone.
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