**1. Introduction**

Bats roost mostly in caves and trees. These roost sites are degrading day by day because of unpredictable human activities [1] especially due to destruction of roost trees at large [2–11]. Customarily tree roosting bats select certain aged trees having well developed canopy area [9, 12–14] it is not clearly known which part of a roost tree is preferred by the bats and why? Or there exists no discretion in respect to roost site selection in a tree.

The Indian flying foxes *Pteropus giganteus* [15] found in India, Bangladesh, Nepal, Bhutan, China, Maldives, Myanmar, Pakistan and Sri Lanka [16]. These frugivorous flying mammals are habituated to spend the day hours at the roost sites specially in selective trees in open spaces [2, 4, 6, 13, 17, 18]. Mostly; these bats select big, well branched and leafy trees for roosting. As there exists many branches of a roost tree and usually the branches are gradually smaller in length with increasing height of the tree we aimed to study the preferential sites, if any, the bats considered for hanging. Accordingly, we selected two roost trees *Albizia lebbeck* (L.) Benth and *Tamarindus indica* (L.) locating at distant places in the village area. The

results, we obtained are very much impacted by the intra-specific competition even if these bats are socially well organized and the members of a colony are guided by the social bindings to carry out allotted duties assigned for the well being of the colony members.
