ant ; ▁there ▁are ▁an ▁estimated ▁ 6 , 0 0 0 ▁adult s ▁in ▁N ki . ▁The ▁park ▁is ▁also ▁home ▁to ▁di urn al ▁prim ates , ▁such ▁as ▁the ▁threatened ▁cr ested ▁mon key , ▁De ▁Bra zza ▁mon key , ▁and ▁the ▁black ▁col ob us , ▁who ▁reported ly ▁only ▁live ▁east ▁of ▁the ▁D ja ▁River . ▁ ▁A ▁ 2 0 - day ▁study ▁held ▁by ▁Bird Life ▁International ▁discovered ▁ 2 6 5 ▁species ▁of ▁birds ▁in ▁the ▁park . ▁Of ▁these , ▁the ▁yellow - bel lied ▁form ▁of ▁forest ▁ro bin ▁is ▁w ides p read . ▁In ▁the ▁study , ▁a ▁pair ▁of ▁D ja ▁River ▁scr ub ▁war bl ers ▁was ▁discovered ▁in ▁a ▁ 1 ▁hect are ▁patch ▁of ▁Rh yn chos por a ▁mar sh ; ▁its ▁population ▁must ▁be ▁small ▁as ▁there ▁are ▁few ▁such ▁mar sh es ▁in ▁N ki . ▁Three ▁species ▁of ▁forest ▁night jar ▁have ▁been ▁observed ▁in ▁the ▁park ; ▁B ate ' s ▁and ▁brown ▁night j ars ▁are ▁common ▁in ▁sout he astern ▁Cam ero on , ▁while ▁a ▁r ar er ▁and ▁un ident ified ▁third ▁species ' ▁call ▁has ▁been ▁heard ▁twice . ▁It ▁is ▁likely ▁that ▁this ▁is ▁Pr ig og ine ' s ▁night jar , ▁as ▁its ▁voice ▁is ▁identical ▁to ▁that ▁of ▁the ▁only ▁known ▁spec imen ▁of ▁this ▁species ▁which ▁was ▁found ▁in ▁the ▁Democratic ▁Republic ▁of ▁Congo . ▁Two ▁small ▁ow ls