1. Salim Ali Centre for Ornithology and Natural History, Anaikatty, Coimbatore 641108, Tamil Nadu, India
2. Salim Ali Centre for Ornithology and Natural History, Anaikatty, Coimbatore 641108, Tamil Nadu, India and Department of Zoology, Faculty of Science, University of South Bohemia, Branišovská 1760, 370 05 České Budějovice, Czech Republic