1 Cornell Laboratory of Ornithology, Cornell University, Ithaca, NY 14850.
2 US Geological Survey Utah Cooperative Fish and Wildlife Research Unit, Department of Wildland Resources, Utah State University, Logan, UT 84322.
3 BirdLife International, Cambridge CB2 3QZ, United Kingdom.
4 British Trust for Ornithology, Thetford IP24 2PU, United Kingdom.
5 Department of Geography, University of Florida, Gainesville, FL 32611.
6 Schubot Avian Health Center, Department of Veterinary Pathobiology, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843.
7 Biodiversity and Conservation Science, Department of Biodiversity, Conservation and Attractions, Bentley, WA 6983, Australia.
8 Department of Zoology, University of Cambridge, Cambridge CB2 3EJ, United Kingdom.
9 Centro de Ecología Aplicada del Litoral, Consejo Nacional de Investigaciones Científicas y Técnicas, 3400 Corrientes, Argentina.
10 Division of Migratory Bird Management, US Fish and Wildlife Service, Hadley, MA 01035.
11 Department of Natural Sciences, Manchester Metropolitan University, Manchester M1 5GD, United Kingdom.
12 World Parrot Trust, Hayle TR27 4HY, United Kingdom.
13 Department of Animal Ecology & Systematics, Justus Liebig University Giessen, D-35392 Giessen, Germany.
14 Department of Biological Sciences, University of Venda, Thohoyandou 0950, Republic of South Africa.
15 Instituto de Investigaciones en Biodiversidad y Medio Ambiente, Universidad Nacional del Comahue, Consejo Nacional de Investigaciones Científicas y Técnicas, 8400 Bariloche, Argentina.
16 Eastern Ecological Science Center, US Geological Survey, Laurel, MD 20708.
17 Department of Conservation Biology, Estación Biológica de Doñana (CSIC), Sevilla, 41092 Spain.
18 Centro para el Estudio de Sistemas Marinos, Consejo Nacional de Investigaciones Científicas y Técnicas, U9120ACD Puerto Madryn, Argentina.
19 Wildlife Conservation Society Argentina, Buenos Aires, C1426AKC Argentina.
20 Department of Ecology and Evolutionary Biology, University of California, Los Angeles, CA 90032.
21 Centre for Research into Ecological & Environmental Modelling, School of Mathematics and Statistics, University of St Andrews, St Andrews KY16 9AJ, United Kingdom.