Robert J. Warren,^1,* Roy L. Kirkpatrick,¹ David F. Gibson,^1,** Patrick F. Scanlon<sup>1

1</sup>Department of Fisheries and Wildlife Sciences, Virginia Polytechnic Institute and State University,

^*Present address: School of Forest Resources, University of Georgia, Athens, Georgia 30602, USA.
^**Present address: Wildlife Research and Conservation Commission of the Northern Territories, P.O. Box 1046, Alice Springs, Northern Territory 5750, Australia.