Hood (Espanola) Mockingbird (Nesomimus macdonaldi) How Darwin developed his theory of Evolution. Darwin knew that there was only one species of mockingbird in South America, but he found 3 species of mockingbird on 3 islands in the Galapagos. He concluded that a single colonization of the South American mockingbird had given rise to the 3 different species in the Galapagos. Then he reasoned that probably all mockingbirds in the world had descended from a common ancestor, because they are so similar to each other. Punta Suarez, Espanola Island.
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