Scientists have proven one of Darwin's main theories

British biologists have proven that subspecies of animals do play a key role in their evolution, as Charles Darwin wrote about this. In the second chapter of the Origin of Species, Darwin writes that animal species in which a large number of species are present should contain more “variations” of these species. It is noted that one of the most striking examples of evolution in the writings of Darwin is the history of the Galapagos finches, small birds of the passerine family, very different in nutrition and habitat.
These birds, as Darwin accidentally discovered, descended from one ancestor, but subsequently their appearance, especially the structure and size of the beak, changed markedly when adapting to new ecological niches.
So, finches, which began to feed on the blood of animals, acquired a sharp and thin beak, and their congeners eating plant seeds were very thick and durable.