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Geometric isolation of common ancestral species of finches has led to the development of 14 different species of finches in the Galapagos Island due to the concept of diversification.
Finches, amomg others...
Since Darwin found many species of plants he found many species of finches. Those species, just like the warbler finch, were found on the Galapagos Islands.
Evolution
They're birds of the Galapagos Island
He realized the the finches had been able to adapt to their natural surroundings to survive.
Darwin discovered that the finches were once the same species. Due to isolation, each island produced variations of the original finch species.
Certain species, and how they differed from one island to another; in this case, specifically, finches and tortoises.
The Galapagos Islands
A small island in Galapagos can hold a large number of finches due to absence of their natural predators .
That the finches were similar to the ones on the mainland, but had adapted to the island environment.
Darwin realized finches on the Galapagos Islands were adapted to different regions