There are as many as 18 species of Darwin's finches that have adapted to different feeding opportunities on the Galápagos islands. The Grants studied the medium ground finch (Geospiza fortis), which feeds primarily on

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The medium ground finch (Geospiza fortis) primarily feeds on seeds. This dietary preference has been a significant focus in studies of adaptive evolution, particularly in the work of Peter and Rosemary Grant, who have extensively documented the finches' adaptations to changing environmental conditions and food availability on the Galápagos Islands.

There Are as Many as 18 Species of Darwin's Finches