Beak Size Matters for Finches’ Song, Scientists Suggest

Darwin’s finches in Ecuador’s Galapagos Islands are cornerstones to the late British naturalist Charles Darwin’s theory of natural selection: the size and shape of the finches’ beaks are adapted to take advantage of their individual ecologic niches.

Some of the sparrow-sized songbirds have large beaks which are able to crush hard seeds–an especially useful trait in drought-prone regions. Other finches have short, sharp beaks which are good for eating insects.