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Keith L. Bildstein is Sarkis Acopian Director of Conservation Science at the Acopian Center for Conservation Learning, Hawk Mountain Sanctuary. He is the author of Raptors: The Curious Nature of Diurnal Birds of Prey and Migrating Raptors of the World: Their Ecology and Conservation, both from Cornell, and White Ibis: Wetland Wanderer, coauthor of The Raptor Migration Watch-Site Manual and Raptor Watch: A Global Directory of Raptor Migration Sites, and coeditor of many books, including most recently The State of North America's Birds of Prey.