Institution: | 1. U.S. Fish and Wildlife Service, Division of Migratory Birds, Midwest Regional Office, 5600 American Boulevard. West, Suite 990, Bloomington, MN, 55437-1458 USA;2. Migratory Bird Center, Smithsonian Conservation Biology Institute, National Zoological Park, P.O. Box 37012, MRC 5503, Washington, DC, 20013 USA |