1. Fuller Evolutionary Biology Program; Cornell Laboratory of Ornithology; 159 Sapsucker Woods Road Ithaca NY 14850 USA
2. Department of Ecology and Evolutionary Biology; Cornell University; 215 Tower Road Ithaca NY 14853 USA
3. Efi Arazi School of Computer Science; Herzliya Interdisciplinary Center (IDC); P.O. Box 167, Kanfei Nesharim St. Herzliya 46150 Israel
4. Seção de Aves; Museu de Zoologia, Universidade de São Paulo (MZUSP); Caixa Postal 42.494 CEP 04218-970 São Paulo SP Brazil
5. Watson School of Biological Sciences; Simons Center for Quantitative Biology; Cold Spring Harbor Laboratory; One Bungtown Road Cold Spring Harbor NY 11724 USA