Common Bentwing Bat

The common bent-wing bat, also called Schreibers's long-fingered bat, is an insectivorous bat that forms major colonies. In roosting caves a colony establishes itself in a bell-shaped hollow, which traps body heat and raises the temperature of the roost above the surrounding parts of the cave. Clustering this way reduces the energy lost to shivering (Wikipedia, general species account).

It migrates several times a year depending on the weather at its roost, and the longest migration recorded was 833km. The longest observed period of torpor was about 12 days. The source opened here is general to the species and gives no measurements or Nepal-specific information, so none are stated. Nationally Least Concern (Nepal National Red List 2011).