Group composition and sex ratio in Hanuman Langurs (Semnopithecus entellus) in the Aravali Hills of Rajasthan, India

Abstract

In the present study a total 16 groups of Hanuman Langurs (Semnopithecus entellus), including 11 unimale bisexual troops and five all male bands with a population of 540 animals, were observed at Kumbhalgarh Wildlife Sanctuary in the Aravalli Hills. They were studied for their group size, composition, sex ratio, etc. For this three focal troops BS-2, BS-5 and BS-10 were observed in three different eco-systems. The mean troop size was 41.7 (range 19 to 113) and the mean band size was 15.6 (range 8 to 32). The adult male-female sex ratio comes to 1:4.6 in the study area.