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Birth of New Species Witnessed by Scientists

On one of the Galapagos islands whose finches shaped the theories of a young Charles Darwin, biologists have witnessed that elusive moment when a single species splits in two.

In many ways, the split followed predictable patterns, requiring a hybrid newcomer who’d already taken baby steps down a new evolutionary path. But playing an unexpected part was chance, and the newcomer singing his own special song.

The species’ forefather was a medium ground finch, or Geospiza fortis, who flew from a neighboring island to the Grants’ island of Daphne Major, and into their nets, in 1981. He “was unusually large, especially in beak width, sang an unusual song” and had a few gene variants that could be traced to another finch species, they wrote. This exotic stranger soon found a mate, who also happened to have a few hybrid genes. The happy couple had five sons.


http://www.wired.com/wiredscience/2009/11/speciation-in-action/


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