1. Cornell Laboratory of Ornithology, Cornell University, 159 Sapsucker Woods Road, Ithaca, NY 14850, USA
2. UMR 7204, Muséum National d'Histoire Naturelle, 4, Avenue du Petit Château, 91800 Brunoy, France
3. Archbold Biological Station, PO Box 2057, Lake Placid, FL 33862, USA