1. U.S. Fish and Wildlife Service National Wildlife Refuge System 500 Gold Avenue SW Albuquerque NM 87102 USA
2. U.S. Fish and Wildlife Service Aransas National Wildlife Refuge 1 Wildlife Circle Austwell TX 77950 USA
3. U.S. Geological Survey, New Mexico Cooperative Fish and Wildlife Research Unit, Department of Fish, Wildlife and Conservation Ecology New Mexico State University P.O. Box 30003, MSC 4901 Las Cruces NM 88003 USA