▁the ▁criteria ▁to ▁be ▁listed ▁as ▁crit ically ▁end anger ed ▁by ▁IU CN . ▁ ▁Singapore ▁population ▁The ▁R aff les ' ▁band ed ▁lang ur ▁was ▁once ▁common ▁throughout ▁the ▁island ▁of ▁Singapore ▁but ▁that ▁population ▁is ▁now ▁crit ically ▁end anger ed ▁with ▁approximately ▁ 6 0 ▁individuals ▁left ▁in ▁the ▁Central ▁C atch ment ▁Nature ▁Reserve . ▁The ▁species ▁was ▁formerly ▁found ▁in ▁the ▁B uk it ▁Tim ah ▁Nature ▁Reserve , ▁but ▁that ▁population ▁died ▁out ▁in ▁ 1 9 8 7 . ▁ ▁The ▁last ▁individual ▁to ▁live ▁in ▁B uk it ▁Tim ah ▁is ▁now ▁displayed ▁at ▁the ▁R aff les ▁Museum ▁of ▁B iod iversity ▁Research . ▁ ▁The ▁Central ▁C atch ment ▁population ▁had ▁decl ined ▁to ▁as ▁few ▁as ▁ 1 0 - 1 5 ▁mon keys ▁before ▁recover ing ▁to ▁about ▁ 4 0 ▁by ▁ 2 0 1 2 ▁and ▁ 6 0 ▁by ▁ 2 0 1 9 . ▁ ▁The ▁main ▁threat ▁to ▁the ▁Singapore ▁population ▁appears ▁to ▁be ▁habitat ▁loss . ▁▁ 9 9 . 8 % ▁of ▁Singapore ' s ▁original ▁primary ▁forest , ▁including ▁much ▁of ▁its ▁dip ter oc arp ▁fl ora , ▁has ▁been ▁elimin ated , ▁with ▁less ▁than ▁ 2 0 0 ▁ha ▁remaining , ▁primarily ▁in ▁B uk it ▁Tim ah ▁and ▁the ▁Mac R itch ie ▁Res er voir ▁and ▁Ne e ▁So on ▁Sw amp ▁Forest ▁port ions ▁of ▁Central ▁C atch ment . ▁ ▁The ▁Ne e ▁So