Darwin's Finches are a group of about 15 species of small birds found on the Galápagos Islands. They are famous for their diverse beak shapes and sizes, which have adapted to different food sources available on the islands. These adaptations played a crucial role in the study of evolution and natural selection. The finches were studied by Charles Darwin during his voyage on the HMS Beagle in the 1830s. His observations of these birds contributed to his theory of evolution, illustrating how species can change over time in response to their environment.