related . ▁Since ▁the ▁A EN P ' s ▁original ▁mission ▁was ▁to ▁re int rodu ce ▁certain ▁m ega - her b iv ores , ▁like ▁the ▁African ▁ele ph ant ▁and ▁black ▁r hin oc eros , ▁primary ▁e colog ical ▁efforts ▁were ▁made ▁to ▁preserve ▁m amm al ian ▁species . ▁However , ▁by ▁over looking ▁the ▁other ▁contrib utors ▁to ▁this ▁environmental ▁chain , ▁certain ▁plant ▁species ▁have ▁been ▁subject ed ▁to ▁over gra zing ▁and ▁tram pling , ▁mostly ▁by ▁the ▁ele ph ants ▁of ▁the ▁park . ▁This ▁over gra zing ▁and ▁tram pling ▁not ▁only ▁dest ro ys ▁much ▁of ▁the ▁plant ▁life , ▁but ▁also ▁forces ▁it ▁to ▁adapt ▁its ▁phys i ology ▁to ▁stim uli ▁that ▁are ▁not ▁inher ent ▁to ▁its ▁evolution ary ▁progress . ▁Some ▁bi olog ists ▁argue ▁that ▁it ▁is ▁not ▁her b iv or ization ▁alone ▁that ▁is ▁threaten ing ▁the ▁fl ora , ▁but ▁a ▁number ▁of ▁other ▁e colog ical ▁factors ▁including ▁zo och ory ▁and ▁nut ri ent ▁cy cling . ▁Up ▁to ▁ 7 7 ▁species ▁of ▁South ▁African ▁en demic ▁plant ▁species ▁have ▁been ▁listed ▁as ▁" v ul ner able ▁to ▁ele ph ant ▁brow sing ." ▁ ▁Marine ▁protected ▁areas ▁ ▁The ▁Add o ▁Ele ph ant ▁National ▁Park ▁Marine ▁Prote cted ▁Area ▁and ▁Bird ▁Island ▁Marine ▁Prote cted ▁Area ▁are ▁associated ▁with ▁the ▁park . ▁ ▁Tour ism ▁ ▁In ▁ 2 0 1 8 ▁the ▁highest ▁visitor ▁count ▁in ▁the