Photo: Ancient Global Warming Spurred Primates Into North America, Fossils Show

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An illustrated map shows hypothetical migration routes of an ancient primate called Teilhardina. A new study suggests that a period of global warming 55 million years ago created forested land bridges between continents that allowed the animals to spread across the Northern Hemisphere from Asia to North America.

Illustration by Bonnie Miljour, courtesy PNAS

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