This eventual process of speciation by natural selection ... Evidence for ecological speciation and its alternative. Science 323, 737–741 (2009). Turner, T. L., Hahn, M. W.

This process ... seeds, insects, flowers, the blood of seabirds, and leaves. The ancestral finch was a ground-dwelling, seed-eating finch. After the burst of speciation in the Galapagos, a ...