New Delhi, May 17 -- Last month, the ruins of Tughlaqabad in Delhi served as a backdrop to a unique morning walk. A set of naturalists and researchers urged a group of walkers to look beyond the built heritage, lift their gaze up to the dark crevices and holes and explore the world of bats within. As part of another session that very week, at Sunder Nursery, a team from World Wide Fund for Nature-India with Rohit Chakravarty, bat researcher at the Centre for Wildlife Studies, got a group of people to spend the evening listening to and identifying bat calls, so that they could understand the behaviour and role of bats in the environment. Using bat detectors and acoustic devices, the participants listened to and interpreted bat vocalisation...