What animals did Darwin find at the Galapagos Islands?

At the Galapagos Islands, Charles Darwin observed several unique animal species that contributed to his theory of evolution. Notable examples include the finches, which exhibited a variety of beak shapes adapted to different food sources, and the giant tortoises, each with distinct shell shapes depending on their specific island habitats. He also encountered marine iguanas and a variety of birds, such as the mockingbirds, which further illustrated the concept of adaptation and speciation. These observations played a crucial role in shaping his ideas about natural selection.