1. Golden Gate Raptor Observatory, Golden Gate National Parks Conservancy , Sausalito, CA 94965, USA
2. Colgate University Department of Biology, , Hamilton, NY 13346, USA
3. State University of New York College of Environmental Science and Forestry Department of Environmental Biology, , Syracuse, NY 13210, USA
4. National Park Service , Gulf Breeze, FL 32563, USA
5. Hamilton College Department of Biology, , Clinton, NY 13323, USA