1. Laboratory of Genetics; University of Wisconsin; Madison WI 53706 USA
2. Department of Biology; University of Fribourg; Fribourg Switzerland
3. Divisions of Human Biology and Basic Sciences; Fred Hutchinson Cancer Research Center; Seattle WA 98109 USA
4. Departamento de Biologia Animal; Centre for Environmental and Marine Studies; Faculdade de Ciências da Universidade de Lisboa; 1749-016 Lisbon Portugal
5. Department of Ecology and Evolutionary Biology; Cornell University; Ithaca NY 14853-2701 USA
6. Royal Society for the Protection of Birds; The Lodge; Bedfordshire Sandy UK
7. Percy FitzPatrick Institute of African Ornithology; University of Cape Town; DST/NRF Centre of Excellence; Rondebosch 7701 South Africa