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tortoises
he studied finches iguanas and tortoises. :)
turtles have shells....
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He observed things with his eyes :)
He observed the finches from the Galapagos islands, the mussels from the land lifted in Chile, the huge tortoises and dark lizards.
While Charles Darwin was in Galapagos, he visited the islands of Floreana, Isabela, San Cristóbal, and Santiago only.
Finches...he based his theory on the shape of their beaks
In the finches, Charles Darwin observed the different beak shapes according to where they lived in the Galapagos. He later linked their beak shapes to the food they ate. Their beaks were shaped to make it more convenient to get their food. In tortoises, he observed the shapes of their shells. The shell shapes got either progressively curvier or progressively less curvy as you travel up or down the island. And I'm not 100% sure about the theory thing, but I think it's the Theory of Evolution
Charles Darwin is not an inventor but he proposed the theory of evolution after constant visits to the Galapagos islands to study the difference between small and giant tortoises and observations on the similarity of behaviour between humans and chimpanzees