phere ▁Reserve ▁was ▁declared ▁with ▁and ▁area ▁of ▁ 7 6 5   km 2 ▁that ▁included ▁the ▁ 3 4 0   km 2 ▁of ▁san ctu ary ▁area ▁as ▁the ▁core . ▁In ▁ 1 9 9 9 , ▁the ▁ 3 4 0   km 2 ▁of ▁san ctu ary ▁area ▁was ▁declared ▁as ▁national ▁park . ▁ ▁Origin ally ▁created ▁to ▁help ▁con serve ▁the ▁habitat ▁of ▁the ▁rare ▁white - wing ed ▁wood ▁du ck , ▁the ▁park ▁is ▁also ▁home ▁to ▁other ▁rare ▁cre atures ▁such ▁as ▁water ▁buff alo , ▁black - bre asted ▁par rot b ill , ▁t iger ▁and ▁c apped ▁lang ur . ▁The ▁park ▁also ▁has ▁some ▁e co ▁lod ges . ▁ ▁Flora ▁ ▁The ▁forest ▁of ▁D ib ru - Sa ik how a ▁consists ▁of ▁semi - ever green ▁for ests , ▁decid uous , ▁litt oral ▁and ▁sw amp ▁for ests ▁and ▁patch es ▁of ▁wet ▁ever green ▁for ests . ▁The ▁national ▁park ▁is ▁about ▁ 3 5 . 8 4 % ▁mo ist ▁mixed ▁forest , ▁ 9 . 5 0 % ▁de grad ed ▁forest ▁and ▁ 2 1 . 2 5 % ▁grass land . ▁Major ▁tree ▁species ▁of ▁the ▁area ▁are ▁t et ras per ma , ▁D ill enia ▁ind ica , ▁Bischof ia ▁jav an ica , ▁Bomb ax ▁ce iba , ▁L ager st ro emia ▁par v if l ora , ▁Terminal ia ▁my ri oc ar pa