Tonkin black crested gibbonThe Tonkin black crested gibbon is a critically endangered subspecies of the black crested gibbon found in Yunnan and Vietnam.DistributionGeographic rangeThe Tonkin black crested gibbon is found occurs in central and southwestern Yunnan and in northern Vietnam, precisely in Lao Cai, Yen Bai, Son La and Lai Châu provinces.HabitatThe Tonkin black-crested gibbon lives in forests at altitudes of between.BehaviorSocial structureThe Tonkin black-crested gibbon lives in groups.FeedingThe Tonkin black-crested gibbon feeds mainly on leaves, fruits, figs and flowers.ConservationStatusAs of November 2015, the Tonkin black crested gibbon is critically endangered.ThreatsThe Tonkin black-crested gibbon is threatened by the destructive use of local forests, hunting, selective logging and the encroachment of agriculture on its environment.