After reading this article on butterfly evolution, I realized something: along the evolutionary time line, animals and people have migrated into the New World from the Old World, but into the Old World from the New World.
What's up with that? Is the Bering Strait a one-way street or something? Do you know of any animals (recent American ex-pats and invasive species brought over by people excluded, of course) who migrated from the New World to the Old World to form new species?
What a weird thing to happen, don't you think? How eerily similar to European expansion it is.
[Article via NYTimes]
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