Nancy Lowe, Sharon Ballew &John Pickering
University of Georgia, Athens
We thank Nalini Hasija, Becca Haynes, Irina Kim, Denise & Sharon Lim of Discover Life for technical assistance with photographs, figures, and text.
We thank Gladys Cotter & Annie Simpson, US Geological Survey, National Biological Information Infrastructure for financial support.
Photographs and scanned images are copyrighted by the individual photographers with all rights reserved, 2002.