▁by ▁another ▁black ▁stri pe ▁across ▁the ▁shoulders ▁and ▁to ▁the ▁for ear ms . ▁M ales ▁leave ▁their ▁n atal ▁group ▁before ▁reaching ▁m atur ity , ▁at ▁about ▁ 4 ▁years ▁old . ▁ ▁The ▁call ▁of ▁m ature ▁males ▁sounds ▁like ▁" ke - ke - ke ." ▁ ▁M amm alog ist ▁Ron ald ▁M . ▁Now ak ▁described ▁the ▁species ' ▁alarm ▁call ▁as ▁" a ▁har sh ▁r attle ▁followed ▁by ▁a ▁loud ▁ch ak - ch ak - ch ak - ch ak ." ▁ ▁Conserv ation ▁status ▁The ▁IU CN ▁ass essed ▁Pres by tis ▁fem or alis ▁as ▁being ▁near ▁threatened ▁in ▁ 2 0 0 8 . ▁ ▁That ▁was ▁prior ▁to ▁the ▁tax onom ic ▁re ass ess ment , ▁and ▁so ▁included ▁Robinson ' s ▁band ed ▁lang ur ▁within ▁the ▁species . ▁ ▁At ▁the ▁time ▁they ▁ass essed ▁the ▁( then ) ▁sub species ▁P . ▁f . ▁fem or alis ▁as ▁vulner able . ▁ ▁After ▁the ▁tax onom ic ▁re ass ess ment , ▁there ▁are ▁only ▁about ▁ 3 0 0 – 4 0 0 ▁R aff les ' ▁band ed ▁lang urs ▁remaining — about ▁ 2 5 0 ▁to ▁ 3 0 0 ▁and ▁possibly ▁fewer ▁in ▁Malays ia ▁and ▁about ▁ 6 0 ▁in ▁Singapore . ▁ ▁As ▁a ▁result ▁of ▁the ▁small , ▁fragment ed ▁population ▁and ▁continu ing ▁risk ▁of ▁further ▁def or est ation , ▁the ▁species ▁now ▁likely ▁meets