urs ing ▁and ▁protect ing ▁her ▁al tr icial ▁ne on ates . ▁Little ▁else ▁is ▁noted ▁in ▁regards ▁to ▁the ▁parent al ▁invest ment ▁and ▁care ▁of ▁the ▁black - sp otted ▁c us cus . ▁ ▁Diet ▁Little ▁is ▁known ▁about ▁the ▁di et ary ▁hab its ▁of ▁this ▁species . ▁They ▁are ▁believed ▁to ▁be ▁om n iv ores ▁that ▁consume ▁small ▁animals . ▁In ▁addition , ▁they ▁feed ▁upon ▁f ruits , ▁leaves , ▁n uts . ▁ ▁Population ▁From ▁ 1 9 8 2 ▁to ▁ 1 9 9 0 , ▁the ▁International ▁Union ▁for ▁Conserv ation ▁of ▁Nature ▁( I U CN ) ▁stated ▁that ▁the ▁species ▁was ▁“ R are ”. ▁This ▁was ▁until ▁its ▁status ▁was ▁changed ▁to ▁“ V ul ner able ” ▁in ▁ 1 9 9 4 ▁and ▁then ▁to ▁“ End anger ed ” ▁in ▁ 1 9 9 6 . ▁According ▁to ▁the ▁IU CN , ▁the ▁black - sp otted ▁c us cus ▁has ▁been ▁class ified ▁as ▁Crit ically ▁End anger ed ▁since ▁ 2 0 1 0 . ▁The ▁population ▁of ▁this ▁species ▁is ▁dr ast ically ▁decl ining ▁due ▁to ▁human ▁dis ru ptions . ▁▁ ▁The ▁expansion ▁of ▁human ▁populations ▁has ▁led ▁to ▁the ▁conversion ▁from ▁forest ry ▁to ▁cultiv ated ▁land ▁for ▁agricult ural ▁purposes . ▁For ▁instance , ▁there ▁has ▁been ▁an ▁infl ux ▁of ▁J avan ▁people ▁into ▁Pap ua ▁New ▁Guinea , ▁which ▁dest ro ys ▁the ▁habit ats ▁of ▁the