Celebrating Darwin
l. to r.: David Hosking / Photoresearchers; B. Rosemary Grant / Science / AP
Darwin's Finches
Due to natural selection, each of the 14 finch species of the Galápagos (known as Darwin's finches) has evolved characteristics suited ideally to its ecological niche. The large ground finch, right, has a short, stout beak for crushing seeds, while the cactus finch uses its narrower bill to probe for insects on prickly pear plants.
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