His identification of the birds now nicknamed `` PERSON@1 's finches '' was pivotal in the inception of PERSON@1 's theory of evolution by natural selection , though they are barely mentioned in PERSON@2 's book , On the Origin of Species .

His knowledge of the birds now called `` PERSON@1 's finches '' was a turning point in the PERSON@2 's thinking about evolution by natural selection . They are barely mentioned in PERSON@2 's book , On the Origin of Species .
