Some species of megafauna might have existed for much longer than the paleontological canon suggests.
Current thinking says that ancient, large animals such as ground sloths went extinct about 11,000 years ago — at the beginning of the Holocene, the current geologic epoch. The discovery of a 4,000-year-old wooly mammoth, reported last year, helped to chip away at that story. Now, other megafauna fossil finds from South America appear to be even younger: They date from around 3,500 years ago, researchers report in the Feb. 15 Journal of South American Earth Sciences.
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