Smilodon populator first appeared in South America about 1 million years ago (where it probably evolved from Smilodon fatalis). hese cats existed until around 10,000 years ago, when the last became extinct. To compare, all three have coexisted with humans for thousands of years. It is estimated by some anthropologists that humans may have arrived in the Americas as early as 25,000 years ago, although most would estimate closer to 11,000 years.
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