▁Nature ▁Conserv ancy ▁portion ▁of ▁the ▁island ▁does ▁not ▁belong ▁to ▁the ▁park . ▁A ▁gift ▁of ▁ ▁from ▁the ▁Nature ▁Conserv ancy ▁to ▁the ▁park ▁was ▁completed ▁in ▁ 2 0 0 0 . ▁ ▁Channel ▁Islands ▁National ▁Park ▁own s ▁and ▁oper ates ▁approximately ▁ 2 4 % ▁of ▁Santa ▁Cruz ▁Island . ▁The ▁remaining ▁land , ▁known ▁as ▁the ▁Santa ▁Cruz ▁Island ▁Reserve , ▁is ▁used ▁for ▁scientific ▁research ▁and ▁education , ▁and ▁is ▁managed ▁by ▁a ▁combination ▁of ▁organizations ▁which ▁includes ▁The ▁Nature ▁Conserv ancy , ▁the ▁University ▁of ▁California ▁Natural ▁Reserve ▁System , ▁and ▁the ▁Santa ▁Cruz ▁Island ▁Foundation . ▁The ▁Reserve ▁and ▁its ▁staff ▁provides ▁accommod ations ▁for ▁visit ing ▁students ▁and ▁research ers . ▁ ▁Wild life , ▁plants , ▁and ▁climate ▁ ▁Int rodu ced ▁and ▁invas ive ▁species ▁on ▁Santa ▁Cruz ▁Island ▁include : ▁▁ ▁Golden ▁e agle ▁( inv ader ), ▁which ▁replaced ▁the ▁native ▁bald ▁e agle , ▁and ▁h unted ▁island ▁fo xes ▁to ▁threatened ▁status . ▁ ▁F enn el ▁( int rodu ced ), ▁served ▁as ▁cover ▁for ▁Island ▁fo xes , ▁but ▁as ▁for age ▁for ▁the ▁fer al ▁p igs . ▁ ▁Fer al ▁p igs ▁( int rodu ced ), ▁disp la ced ▁native ▁island ▁fo xes . ▁ ▁Santa ▁Cruz ▁sheep ▁ ▁Santa ▁Cruz ▁Island ▁horse ▁ ▁Native ▁species ▁include : ▁▁ ▁Island ▁scr ub - j ay , ▁which ▁is ▁only ▁found ▁on ▁Santa ▁Cruz ▁Island ▁ ▁Hoff man ' s ▁rock c ress