We thank Kevin McGowan, Cornell Lab of Ornithology, and Mark Wimer, Breeding Bird Survey, USGS, for checklists of North American birds.
Photographs and scanned images were taken by Sharon Ballew, Becca Haynes, and John Pickering at the University of Georgia.All are copyrighted by John Pickering with all rights reserved, 2000.
We thank Liz McGhee, University of Georgia's Natural History Museum, for providing specimens.
We thank Denise Lim for technical assistance with photographs, figures, and text.
Please send comments of how this software and guide can be improved to John Pickering .