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Twins were the norm for our ancient primate ancestors − one baby at a time had evolutionary advantages

By Tesla Monson, Associate Professor of Anthropology, Western Washington University
Jack McBride, Ph.D. Student in Anthropology, Yale University

Twins are pretty rare, accounting for just 3% of births in the US these days. But new research shows that for primates 60 million years ago, giving birth to twins was the norm.

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