1. when the finches first colonized santa maria and san cristobal, g. fuliginosa probably had beak sizes similar to finches on daphne island, and g. fortis probably had beak sizes similar to finches on island. 2. significant overlap in beak size would have resulted in for food. 3. natural selection favored phenotypes that competed for food. 4. in g. fortis, finches with were selected for. 5. in g. fuliginosa, finches with were selected for. 6. each species experienced selection, which resulted in character displacement for beak size. 7. character displacement is adaptive for both populations because it interspecific competition.