they all digest food and it comes out the anis *improved answer* actually it's spelled anus. He studied finches and the different types of beaks the finches had, which led him to find the evolution theory.
Charles Darwin was influenced by his trip to the Galapagos islands.
the douugie fresh song
Geographic isolation of a common ancestral species of finches
Yes, he did.
On each island of the Galapagos Islands
The embryos help Darwin find that finches came from the same ancestor which they go through phases of evolutions, this depends on the island the finches are located. Darwin discover that in different islands the beak from the finches were bigger hence stronger to crack difficult shells from plans, but in a different island finches have smaller beaks to get nectar from that plants. Darwin came to the conclusion that finches adapt from their environment.
Galapagos Islands
On Isabella Island, part of the Galápagos archipelago, Charles Darwin observed a variety of unique wildlife and geological features that contributed to his theory of evolution. He noted the diversity of finch species, which adapted to different environments and food sources, leading to his insights on natural selection. Additionally, he studied the giant tortoises and various plants, all of which exemplified the concept of adaptation to specific ecological niches. These observations helped shape his groundbreaking ideas about species evolution and the process of speciation.
Some of the other organisms Charles Darwin found in the Galapagos Islands include giant tortoises, marine iguanas, blue-footed boobies, finches (later known as Darwin's finches), and various unique plant species. These organisms played a significant role in shaping Darwin's theory of evolution by natural selection.
You can get started here: http://x-evolutionist.com/charles-darwin-described-the-problems-with-his-theory-in-his-book-origin-of-species/
he thought that some of the birds were wrens ,some were warbles,and some were Blackbirds