1. Box 1137 Department of Biology, Washington University St. Louis Missouri 63130, USA; E-mail: larsontl@biology.wustl.edu (A.L.)
2. Center for Conservation and Research, Henry Doorly Zoo 3701 S. 10th St., Omaha, Nebraska 68107, USA; E-mail: edlo@omahazoo.com
3. Department of Evolutionary Genomics, Joint Genome Institute, Lawrence Berkeley National Laboratory 2800 Mitchell Dr. Building 400, Walnut Creek, California 94598–1631, USA; E-mail: JRMacey@lbl.gov