▁of ▁about ▁ 1 2 ▁females ▁during ▁each ▁subsequent ▁year ▁is ▁sufficient ▁to ▁lower ▁the ▁ext inction ▁probability ▁due ▁to ▁dem ographic ▁st ochastic ity ▁in ▁each ▁release ▁to ▁less ▁than ▁ 1 % ▁over ▁ 1 0 0 ▁years ▁while ▁maintain ing ▁a ▁bre eding ▁source ▁size ▁of ▁ 2 5 0 ▁de er . ▁ ▁Dis pers al , ▁movement ▁patterns , ▁and ▁home ▁range ▁Size ▁of ▁the ▁home ▁range ▁can ▁also ▁affect ▁the ▁ch ances ▁of ▁ext inction , ▁since ▁a ▁species ▁is ▁more ▁likely ▁to ▁go ▁ext inct ▁when ▁its ▁habitat ▁is ▁smaller . ▁While ▁it ▁is ▁necessary ▁for ▁de er ▁to ▁dis per se ▁and ▁establish ▁themselves ▁in ▁a ▁habitat , ▁having ▁a ▁range ▁that ▁is ▁too ▁broad ▁can ▁also ▁be ▁det r iment al ▁because ▁the ▁population ▁can ▁become ▁th inned ▁out ▁and ▁more ▁vulner able ▁to ▁thre ats , ▁such ▁as ▁fragment ation . ▁ ▁Fragment ation , ▁which ▁can ▁lead ▁to ▁lower ▁gen etic ▁variation ▁through ▁in bre eding ▁in ▁small ▁sub pop ulations , ▁is ▁of ▁particular ▁importance ▁in ▁the ▁Pers ian ▁fall ow ▁de er ▁because ▁their ▁gen etic ▁vari ability ▁is ▁already ▁low . ▁ ▁Pers ian ▁fall ow ▁de er ▁home ▁range ▁sizes ▁vary ▁based ▁on ▁gender ▁and ▁age . ▁ ▁Old er ▁male ▁de er ▁are ▁more ▁territorial ▁than ▁younger ▁males ; ▁however , ▁older ▁females ▁stay ▁closer ▁to ▁the ▁site ▁( with in ▁an ▁average ▁of ▁ 0 . 9   km ) ▁where ▁they ▁were ▁re int rodu