I thank Susan Koenig, Steve Latta, Catherine Levy, Chris Rimmer, Jim McGuire for unpublished data and help, and Miguel Landestoy for the photo. I likewise thank the UC Berkeley librarians, who were eager to help locate obscure references. The National Environmental Protection Agency (Jamaica) generously provided research and export permits for my research in Jamaica in 2004 and 2005. My field-work was financially supported by the Museum of Vertebrate Zoology, the American Ornithologists' Union, Sigma Xi, the Center for Latin American Studies (UC Berkeley), and the American Museum of Natural Hisotry. I would especially like to thank the various bird enthusiasts that elected to publish their observations of Vervain Hummingbirds in the Gosse Bird Club Broadsheet, without whom this species would be far less accurately known. To obtain multimedia (.wav files of songs, or video of the Competitive Vertical Ascent), or mites found on Vervain Hummingbird rectrices, email firstname.lastname@example.org.
We are grateful to Claudia Silva for translating this account from English into Spanish.