1. U.S. Geological Survey, Patuxent Wildlife Research Center, National Museum of Natural History, Washington, DC, USA
2. Department of Biology, San Diego State University, San Diego, California, USA
3. Museum of Vertebrate Zoology, University of California, Berkeley, California, USA
4. Bishop, California, USA
5. Florida Museum of Natural History, University of Florida, Gainesville, Florida, USA
6. Cornell Laboratory of Ornithology, Ithaca, New York, USA
7. Michigan State University Museum and Department of Integrative Biology, East Lansing, Michigan, USA
8. Museum of Natural Science and Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana, USA
9. Department of Ecology and Evolutionary Biology, Ramsay Wright Labs, University of Toronto, Toronto, Ontario, Canada
10. Science and Education, Field Museum of Natural History, Chicago, Illinois, USA
11. University of Alaska Museum, Fairbanks, Alaska, USA