Group size and composition, sex ratio and birth seasons in Hanuman Langurs in Morni Hills of Haryana, India.

摘要

A survey of Hanuman Langurs was carried out in Morni Hills of Haryana from June 2009 to June 2011. Data were recorded on group size, group composition, sex ratio and birth seasons in the langurs. In all, 24 groups of Hanuman Langurs including 18 bisexual, 5 all male and 1solitary male with a population of 432 individuals were found inhabiting different habitats in the study area. Out of these, three bisexual study groups BT (20 individuals), ST (30 individuals) and TB (27 individuals) were selected for the detailed study. These three focal troops were living in three different ecological conditions. The average troop size was 22.3 (range 14-30) and average band size was 5.8 (range 5-10). The adult male to female ratio was 1:3.2. The langurs in Morni Hills are very shy and do not raid human settlements. They rely on natural food and show no interest in provisioned food. Their breeding has been found to be restricted only in few months of the year from, i.e., from December to March.