The disappearance of megafauna in America—mammoths, saber-toothed cats, giant sloths, among others—happened relatively soon after the arrival of human beings, about 13,000 years ago.
North America was populated by a wide variety of great beasts, like mammoth and mastodons, both elephant-like creatures with big tusks, and camels, giant sloths, the list goes on.
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据研究者说，他们还首次完成了已灭绝的美洲乳齿象细胞核DNA序列的测定。
The researchers also made what they say are the first sequences of nuclear DNA from the extinct American mastodon.
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