1. Department of Biology; University of Pisa; Via Volta 6 56126 Pisa Italy
2. Department of Psychology and J. P. Scott Center for Neuroscience, Mind and Behavior; Bowling Green State University; Bowling Green OH USA
3. Department of Migration and Immuno-Ecology; Max Planck Institute for Ornithology; Radolfzell Germany
4. Departamento de Biologia; Centro de Ciências Biológicas e da Saúde; Universidade Federal do Maranhão; São Luís MA Brazil
5. Department of Biology; University of Konstanz; Konstanz Germany