1. Wildlife Institute of India, P. B. # 18, Dehradun – 248 001, Uttaranchal, India; Current address: Nature Conservation Foundation, 3076/5, IV Cross, Gokulam Park, Mysore 570002, India. Email corresponding author∗:
2. Sálim Ali Centre for Ornithology and Natural History, Moongil Pallam, Anaikatti, Coimbatore – 641 108, Tamil Nadu, India; Current address: National Centre for Biological Sciences, Tata Institute of Fundamental Research, GKVK Campus, Bellary Road, Bangalore 560065, India.
3. Wildlife Institute of India, P. B. # 18, Dehradun – 248 001, Uttaranchal, India; Current address: Wildlife Conservation Society-India, Centre for Wildlife Studies, 1669, 31st Cross, 16th Main, Banashankari 2nd Stage, Bangalore 560070, India