Matthew W. Reudink,¹ Peter P. Marra,² Kathryn M. Langin,³ Colin E. Studds,⁴ T. Kurt Kyser,⁵ Laurene M. Ratcliffe<sup>6

1</sup>Department of Biology, Queen's University, Kingston, Ontario K7L 3N6, Canada, and Smithsonian Migratory Bird Center, 3001 Connecticut Avenue NW, Washington, D.C. 20008, USA (E-mail: reudinkm@si.edu)
²Smithsonian Migratory Bird Center, 3001 Connecticut Avenue NW, Washington, D.C. 20008, USA
³Department of Biology, Queen's University, Kingston, Ontario K7L 3N6, Canada, and Department of Biology, Colorado State University, Fort Collins, Colorado 80523, USA
⁴Smithsonian Migratory Bird Center, 3001 Connecticut Avenue NW, Washington, D.C. 20008, USA, and Program in Behavior, Ecology, Evolution, and Systematics, University of Maryland, College Park, Maryland 20742, USA
⁵Department of Geological Sciences and Geological Engineering, Queen's University, Kingston, Ontario K7L 3N6, Canada
⁶Department of Biology, Queen's University, Kingston, Ontario K7L 3N6, Canada