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The Galápagos Islands where Darwin saw a variety of animals and plants, many of which were not only native to the island group as a whole, but some were also unique to a specific island. The finches, tortoises, and lizards were especially instructive to him, indicating isolation of mainland organisms that, after reaching the islands, underwent what he was to later call, "descent with modification" (i.e., evolution) from the parent species.
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