It’s common to think of the land bridge that existed from time to time across what is now the Bering Strait as a one-way affair. After all, the route through the area known as Beringia is thought to be how many animals and humans made their way out of Asia and into North America.
But there were no “Eastbound Only” signs. Some animals — the ancestors of the camel, for example — went the other way, from North America into Asia. And there is no reason that a species couldn’t go both ways, if the conditions were right.
That appears to be the case with the woolly mammoth, according to a major phylogenetic analysis of this ancient species.
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