Lebih jauh lagi, kebanyakan dari berbagai burung finch yang menurut Darwin mewakili 14 spesies yang berbeda sebenarnya [mampu] kawin satu sama lain, yang berarti bahwa mereka hanyalah variasi dari satu spesies yang sama.
Moreover, most of the different types of finches which Darwin thought represented 14 distinct species actually mated with one another, which means that they were variations that belonged to the same species.