What makes finches in Galapagos Island a good example of speciation?

The finches of the Galápagos Islands are a classic example of speciation due to their adaptive radiation in response to diverse ecological niches. Each island hosts distinct finch species that have evolved unique beak shapes and sizes, allowing them to exploit different food sources. This diversification illustrates natural selection in action, driven by environmental pressures and isolation. The finches' evolutionary adaptations provide clear evidence of how species can arise and diverge in response to varying habitats and resources.