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Figure 1. The medium ground finch Geospiza fortis
The medium ground finch Geospiza fortis (illustrated here) diverged in beak size from the large ground finch (Geospiza magnirostris) on Daphne Major Island, Galápagos following a severe drought. This character displacement was strongly associated with variation at a genetic locus, HMGA2, with a major effect on beak size that has facilitated the adaptive radiation of Darwin's finches.
© Peter R. Grant
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