1. Field of Zoology and Wildlife Conservation, Cornell University; Fernow Hall, Ithaca NY 14853; USA
2. United States Department of Agriculture, Wildlife Services; National Wildlife Research Center, Mississippi Field Station, P.O. Box 6099; Mississippi State, MS 39762 USA
3. Department of Ecology, Evolution and Environmental Biology; Cornell University; Corson Hall Ithaca NY 14853 USA
4. Department of Natural Resources; Cornell University; Fernow Hall Ithaca NY 14853 USA