Distribution
The regions of its distribution are very small; the main region is limited to an area approximately 60 miles square bounded on the south by the Brahmaputra river, on the east by the Manas river, on the west by the Sankosh river, all in Assam, India, and on the north by the Black Mountains of Bhutan. These biogeographical barriers are believed to have led to the radiation of species from the closely related Capped Langur (Trachypithecus pileatus). The best range maps so far are Choudhury (2002) and Choudhury (2008)
Gee's golden langur is currently endangered; a total Indian population in 2001 of 1,064 individuals, in 130 groups, was recorded. Of these, approximately 60% were adults indicating a relative lack of infants and juveniles. The relative dearth of infants and juveniles indicate a declining population and with the habitat being degraded by human activity. A fragmented but protected population in a rubber plantation in Nayakgaon, Kokrajhar district of Assam increased in population from 38 individuals in 1997 to 52 in 2002. The population has also adapted to feeding on dry rubber seeds.
The smallest golden langur troop was composed of four individuals, while the largest had 22, giving an average value of 8.2 individuals per troop. The adult gender ratio was 2.3 females to every male, although the majority of groups had only one adult male.
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