A jumble of fossil mammoth bones being excavated from a fossil site in southeastern Washington state. Mammoths, which looked like shaggy elephants, were hunted by prehistoric humans who arrived in North America about 11.4 thousand years ago, as shown by the close intermingling of spearpoints with fossil mammal skeletons. However, they also went extinct coincident with climate change in areas where significant human presence has not been shown,
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