1. Department of Wildland Resources and the Berryman Institute; Utah State University; 5230 Old Main Hill Logan UT 84322-5230 USA
2. Division of Vertebrate Zoology; American Museum of Natural History; Central Park West at 79th Street New York NY 10024 USA
3. Department of Natural Resources; Fernow Hall; Cornell University; Ithaca NY 14853 USA
4. Ontario Ministry of Natural Resources; 2140 East Bank Drive Peterborough ON K9J 7B8 Canada
5. Institute of Arctic Biology and Department of Biology & Wildlife; University of Alaska Fairbanks; Fairbanks AK 99775 USA