▁resources . ▁If ▁this ▁happened , ▁the ▁species ▁that ▁was ▁the ▁best ▁compet itor ▁would ▁always ▁exclude ▁its ▁compet itors ▁from ▁that ▁area . ▁Therefore , ▁species ▁must ▁at ▁least ▁have ▁slightly ▁different ▁nich es ▁in ▁order ▁to ▁co exist . ▁ ▁Character ▁disp lacement ▁▁ ▁Compet ition ▁can ▁cause ▁species ▁to ▁evol ve ▁differences ▁in ▁tra its . ▁This ▁occurs ▁because ▁the ▁individuals ▁of ▁a ▁species ▁with ▁tra its ▁similar ▁to ▁compet ing ▁species ▁always ▁experience ▁strong ▁inter specific ▁competition . ▁These ▁individuals ▁have ▁less ▁reprodu ction ▁and ▁surv ival ▁than ▁individuals ▁with ▁tra its ▁that ▁differ ▁from ▁their ▁compet itors . ▁Con sequently , ▁they ▁will ▁not ▁contribute ▁many ▁off spring ▁to ▁future ▁gener ations . ▁For ▁example , ▁Dar win ' s ▁fin ches ▁can ▁be ▁found ▁alone ▁or ▁together ▁on ▁the ▁Gal ap ag os ▁Islands . ▁Both ▁species ' ▁populations ▁actually ▁have ▁more ▁individuals ▁with ▁intermediate - s ized ▁be aks ▁when ▁they ▁live ▁on ▁islands ▁without ▁the ▁other ▁species ▁present . ▁However , ▁when ▁both ▁species ▁are ▁present ▁on ▁the ▁same ▁island , ▁competition ▁is ▁inten se ▁between ▁individuals ▁that ▁have ▁intermediate - s ized ▁be aks ▁of ▁both ▁species ▁because ▁they ▁all ▁require ▁intermediate ▁s ized ▁se eds . ▁Con sequently , ▁individuals ▁with ▁small ▁and ▁large ▁be aks ▁have ▁greater ▁surv ival ▁and ▁reprodu ction ▁on ▁these ▁islands ▁than ▁individuals ▁with ▁intermediate - s ized ▁be aks . ▁D ifferent ▁fin ch ▁species ▁can ▁co exist ▁if ▁they ▁have ▁tra its — for ▁instance ,