ants ▁in ▁the ▁area . ▁The ▁park ▁has ▁proved ▁to ▁be ▁very ▁successful ▁and ▁currently ▁houses ▁more ▁than ▁ 6 0 0 ▁ele ph ants ▁and ▁a ▁large ▁number ▁of ▁other ▁m amm als . ▁ ▁Exp ansion ▁ ▁The ▁original ▁park ▁has ▁subsequently ▁been ▁expanded ▁to ▁include ▁the ▁Wo ody ▁Cape ▁Nature ▁Reserve ▁that ▁extends ▁from ▁the ▁Sund ays ▁River ▁mouth ▁towards ▁Alexand ria ▁and ▁a ▁marine ▁reserve , ▁which ▁includes ▁St . ▁Cro ix ▁Island ▁and ▁Bird ▁Island , ▁both ▁bre eding ▁habitat ▁for ▁g ann ets ▁and ▁p engu ins , ▁not ▁to ▁mention ▁a ▁large ▁variety ▁of ▁other ▁marine ▁life . ▁Bird ▁Island ▁is ▁home ▁to ▁the ▁world ' s ▁largest ▁bre eding ▁col ony ▁of ▁g ann ets ▁- ▁about ▁ 1 2 0 , 0 0 0 ▁birds ▁- ▁and ▁also ▁hosts ▁the ▁second ▁largest ▁bre eding ▁col ony ▁of ▁African ▁p engu ins , ▁the ▁largest ▁bre eding ▁col ony ▁being ▁St . ▁Cro ix ▁island . ▁These ▁marine ▁assets ▁form ▁part ▁of ▁the ▁plan ▁to ▁expand ▁the ▁ 1 , 6 4 0   km ² ▁Add o ▁National ▁Ele ph ant ▁Park ▁into ▁the ▁ 3 , 6 0 0   km ² ▁Gre ater ▁Add o ▁Ele ph ant ▁National ▁Park . ▁ ▁The ▁expansion ▁will ▁mean ▁not ▁only ▁that ▁the ▁park ▁contains ▁five ▁of ▁South ▁Africa ' s ▁seven ▁major ▁veget ation ▁zones ▁( bi om es ), ▁but ▁also ▁that ▁it ▁will ▁be ▁the ▁only ▁park ▁in ▁the ▁world ▁to ▁house