▁be ak ▁size — that ▁allow ▁them ▁to ▁special ize ▁on ▁particular ▁resources . ▁When ▁Ge osp iza ▁fort is ▁and ▁Ge osp iza ▁ful igin osa ▁are ▁present ▁on ▁the ▁same ▁island , ▁G . ▁ful igin osa ▁tends ▁to ▁evol ve ▁a ▁small ▁be ak ▁and ▁G . ▁fort is ▁a ▁large ▁be ak . ▁The ▁observation ▁that ▁compet ing ▁species ' ▁tra its ▁are ▁more ▁different ▁when ▁they ▁live ▁in ▁the ▁same ▁area ▁than ▁when ▁compet ing ▁species ▁live ▁in ▁different ▁areas ▁is ▁called ▁character ▁disp lacement . ▁For ▁the ▁two ▁fin ch ▁species , ▁be ak ▁size ▁was ▁disp la ced : ▁Be aks ▁became ▁smaller ▁in ▁one ▁species ▁and ▁larger ▁in ▁the ▁other ▁species . ▁Studies ▁of ▁character ▁disp lacement ▁are ▁important ▁because ▁they ▁provide ▁evidence ▁that ▁competition ▁is ▁important ▁in ▁determ ining ▁e colog ical ▁and ▁evolution ary ▁patterns ▁in ▁nature . ▁ ▁See ▁also ▁▁ ▁Bi ological ▁interaction ▁ ▁Character ▁disp lacement ▁ ▁Community ▁ ▁Min imum ▁vi able ▁population ▁ ▁Sc ram ble ▁competition ▁ ▁Resource ▁( bi ology ) ▁ ▁Resource ▁partition ing ▁ ▁References ▁ ▁External ▁links ▁http :// www . ency c lopedia . com / topic / Comp et ition _ % 2 8 Bi ology % 2 9 . aspx ▁The ▁Bi ological ▁Bas is ▁for ▁the ▁‘ T hr ill ▁of ▁Vict ory ’ ▁ ▁Category : Comp et ition ▁Category : Bi ological ▁interactions ▁Category : E th ology <0x0A> </s> ▁A ▁grand father ▁clause ▁( or ▁grand