DNA that was collected and tested finally let us identify the most closely related ancestor, which is the seed-eating tanager finches that reside in the Caribbean, Central, and South America. Scientists tried to find when and how the finches came to live in the Galapagos Islands, and it was found out that they must have arrived 2-3 million years ago by looking at the genetic sequences. It is still a mystery as to how the original Finch flew 900 kilometers and more to get to its habitat today, but it is known that a minimum of 25-30 birds made the journey so that they would have been able to reproduce and create the different types of Darwin's Finches that we see today. It is also thought that the types of finches that came from the Americas were already very diverse, as the researched immunity systems of the birds registered diseases that were very different and found in some species of the seed-eating tanager only.
It is also thought that the ancestor could be a blue black grassquit for the section of birds with the crushing beaks.
It is also thought that the ancestor could be a blue black grassquit for the section of birds with the crushing beaks.