Darwin’s medium ground finch is the most iconic of the Galapagos finches — a small seed-eating bird whose beak variations across islands provided Charles Darwin with crucial inspiration for his theory of natural selection. Found on the Galapagos Islands of Ecuador, these finches represent one of evolutionary biology’s most celebrated adaptive radiations. Long-term studies by Peter and Rosemary Grant documented measurable evolutionary change in real time, confirming that natural selection operates far more rapidly than previously imagined.
About the Finch
Geospiza fortis
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01
Darwin's medium ground finch became the first species for which natural selection was directly observed in real time — during the 1977 drought, beak size increased measurably within a single generation.
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The Galapagos finches descended from a single ancestral finch species that colonized the islands approximately 2-3 million years ago and diversified into 18 distinct species.
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Tool use has been recorded in the woodpecker finch, which uses cactus spines or small twigs to extract wood-boring insect larvae from tight crevices.
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Finch beak shapes are so precisely tuned to food sources that scientists can calculate the hardness of the seeds on an island from beak measurements alone.
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During El Niño years when seeds are abundant, medium ground finches evolved measurably smaller beaks within two generations — evolution reversing direction in real time.
📍 Where to Find This Animal
Habitat Types:
Volcanic Island Scrubland
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