Darwin learned that there were different shaped backs of the tortoises, some had arc shaped or straight. The other thing the tortoises had is long or short necks. There were varieties of island and on every island there were different tortoises.
On the Galapagos Islands, Charles Darwin observed unique species of birds, tortoises, finches, and marine iguanas. These observations contributed to the development of his theory of evolution by natural selection.
While Charles Darwin was in Galapagos, he visited the islands of Floreana, Isabela, San Cristóbal, and Santiago only.
Charles Darwin reached the Galapagos islands in 1835. He observed many finches, tortoises and many other animals. He observed that the animals in the Galapagos were different than the animals in other places like south America. This may be because the climate is different in the Galapagos than in other places so the animals may have involved to suit the temperatures in the Galapagos.
tortoises
turtles have shells....
Galapagos Islands are the islands where Charles Darwin observed variation among organisms.
Galapagos finches
charles darwin
Many Galapagos tortoises are breeded in captivity through the Charles Darwin Research Station in conjunction with the Galapagos National Park. This is to help preserve the variety of species and increase the tortoise population on various islands. The tortoises are numbered and eventually released back into the wild. On Santa Cruz, San Cristobal, and Isabela Islands there are Galapagos Tortoise breeding centers that make significant differences in the preservaton of these beautiful creatures.
Charles Darwin
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