Question

Darwin thought the birds he collected from the Galapagos were different types of birds, but he learned that they were different types of finches that each came from a different island in the Galapagos. What was the significance of that discovery?

Answer 1

That discovery showed that species are not fixed but can diverge from a common ancestor in response to different environments. The Galápagos finches were closely related yet had different beak shapes and habits on different islands—clear evidence of adaptive radiation caused by geographic isolation and differing food sources. Those observations were key evidence for Darwin’s ideas of descent with modification and natural selection.