Studying Darwin’s finches has been the life’s work of the renowned British evolutionary biologists Rosemary and Peter Grant. For several months every year for 40 years, the husband-and-wife team visited the Galápagos Islands in the eastern Pacific to meticulously track the fate of thousands of finches on two small islands there. The Grants demonstrated that evolution by natural selection can be observed in the wild in real time: they were the first to see and measure it in action in nature.

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