Darwin did not say this. Darwin collected finches from the Galapagos Islands, believing them to be other words. It was the famous ornithologist, John Gould, who confirmed that 12 samples were all finches, but with enough minor differences for them to be considered new species.
While it was Gould who called them new species, it confirmed to Darwin some of the ideas he'd had about the stability of species, how one colony of organisms can split up and adapt to a new environment.
finches
Finches, amomg others...
Galapagos Finches (Darwin's)
Darwin was puzzled about the many adaptations of the finches on the Galapagos Islands
Geographic isolation of a common ancestral species of finches
finches
That they were evoled from on specie of finches.
Galapagos finches (Darwin's finches)
Galapagos Finches (Darwin's)
Finches, amomg others...
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.
Darwin was puzzled about the many adaptations of the finches on the Galapagos Islands
Geographic isolation of a common ancestral species of finches
He noticed that there were different species of finches.
Darwin was puzzled about the many adaptations of the finches on the Galapagos Islands
Darwin's Finches