Darwin's finches

Darwin's finches are a group of closely related songbird species native to the Galápagos Islands and Cocos Island. Their varied beaks and rapid adaptation have made them a classic example of adaptive radiation.

Natural selection: The process by which heritable traits that improve survival or reproduction become more common across generations. Differences in food supply favor finches whose beaks perform particular tasks well.
Medium ground finch: A Galápagos finch with a stout bill, adapted chiefly to feeding on seeds. Its beak size changed measurably during drought-driven shifts in available seeds.
Charles Darwin: An English naturalist who developed the theory of evolution by natural selection. Darwin collected Galápagos birds, though he initially misidentified several finch specimens.
Passerine: A bird in the order Passeriformes, the largest order of birds, commonly called perching birds or songbirds. Darwin's finches belong to this broad bird order.
Genomics: The study of an organism's complete set of DNA, including its structure, function, and variation. Genome comparisons identify genetic changes associated with finch beak shape.
Adaptive radiation: The diversification of one ancestral lineage into multiple species adapted to different ecological niches. The finches' ecological and morphological diversity exemplifies this pattern.
Geospiza fortis: The scientific name of the medium ground finch, a seed-eating species found in the Galápagos. Long-term studies tracked its beak traits and survival across environmental changes.
HMS Beagle: A British Royal Navy survey ship that carried Charles Darwin on its second voyage from 1831 to 1836. Darwin's Galápagos observations came during this voyage.
Thraupidae: A family of New World songbirds that includes tanagers and Darwin's finches. Modern classification places Darwin's finches within this family.
ALX1: A gene involved in craniofacial development in vertebrates. Variation near ALX1 is associated with beak shape differences among Darwin's finches.

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