ABSTRACT
The plateau is inhabited by a geographically isolated population of Hanuman langurs. Within a radius of 100 km, there are no other langur groups. According to censuses, the population increased from about 800 animals in 1967 to about 1300 in 1987. The reproductive units are bisexual one-male troops (harems) with a single adult breeding male. Each troop
occupies its own home range of about 0.5 - 1.3 km . Troops containing several adult males are rarely found (<10%) and are of short existence. Long-term demographic monitoring of known individuals indicates that (with very few exceptions) females remain in their natal troops throughout their lives. Males emigrate - usually as juveniles - and join all-male bands, whose home ranges can be up to 20 km . On average adult males weigh 18.5 kg and adult females 11.7 kg (for details on ecology and demography see Mohnot, 1974; Mohnot et al, 1981; Winkler et al., 1984; Rajpurohit and Sommer, 1991).
