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This sentence compresses Darwin's discovery into a misleading origin story.

Credible historical sources say Darwin did not formulate natural selection on the Galápagos Islands merely by observing birds there:

1. The Natural History Museum explains that the famous Galápagos finches are often wrongly credited as the direct inspiration for Darwin's theory. Darwin himself originally recorded them as belonging to different bird families, and it was the ornithologist John Gould who later recognized their relationship.
2. The same museum source says the birds that first drew Darwin's attention in the Galápagos were mockingbirds, not finches, and that Darwin began contemplating species change during the voyage but that it took several years before he arrived at the theory of evolution by natural selection.
3. The Darwin Correspondence Project says Darwin only reached the conviction that species were mutable by the middle of March 1837, after his return to England, apparently through reflecting on Gould's and Richard Owen's identifications of his specimens. It further says Malthus in September 1838 supplied the causal mechanism that became natural selection.

So the claim that Darwin went to the Galápagos, observed birds, and thereby "got" the theory is historically wrong: the theory emerged later, through extended reflection in England and with crucial help from later expert identifications and Malthus's ideas.