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The offspring of those that survived the 1976 drought shows how quickly the process of natural selection took place and how quickly the finches evolved.

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The first large-beaked species separated and developed into three different large-beaked species based on changes in habitat and food availability.

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Beak Sizes of Medium Ground Finches Before and After the Drought

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Beak Sizes of Medium Ground Finches Before and After the Drought

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The drought made the availability of small seeds much lower, favoring finches with larger beaks. Because they had better access to larger seeds, they had a higher survival rate than those with smaller beaks.

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The first medium species (#8) separated and developed into three different medium species.

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The first small-beaked species then was separated and developed into three different species based on changes in habitat and food availability.

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These species developed large, curved beaks, likely from the availability of large, hard seeds.

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These species developed medium beaks because of their food availability.

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These species developed sharp, pointy beaks, likely from the availability of small seeds and cactus needles.

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Beak Sizes of Medium Ground Finches Before the Drought of 1977

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Beak Sizes of Medium Ground Finches Before the Drought of 1977

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Before the major drought in 1977, there was a bell curve distribution of Medium Ground finches. There were few small beaked finches and few large beaked finches, but many medium beaked finches. This was considered the normal distribution of finches.

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These were the first species of finches to reach the islands.