1. Environment Canada; 11 Innovation Blvd Saskatoon Saskatchewan S7N 3H5 Canada
2. Division of Biological Sciences; University of Missouri; Columbia Missouri 65211 USA
3. Estacion Ornitologica La Mucuy; Parque Nacional Sierra Nevada; Merida Venezuela
4. Instituto de Ecología y Sistemática de Ciudad de la Habana; Havana Cuba
5. Canadian Wildlife Service; Quebec City Quebec G1J OC3 Canada
6. Department of Fisheries and Wildlife Sciences; 302 ABNR, University of Missouri Colombia Missouri 65211 USA