Abstract

*Denver Zoological Foundation, 2300 Steele Street, Denver, CO 80205, U.S.A. tUniversity of Maryland, Frostville, MD 21532, U.S.A. *Yale University School of Forestry and Environment, 205 Prospect Street, New Haven, CT 065 11, U.S.A. SInstituto de Ecologia, UNAM, Apartado Postal 70-275, Mexico D.F., C.P. 04510 **The Wildlands Project, Apartado Postal 98, Metepec 3, Estado de Mexico, C.P. 52176, Mexico tt9443 Cottonwood, Bozeman, MT 59715, U.S.A. #U.S. Fish and Wildlife Service, 2900 4th Avenue North, Room 301, Billings, MT 59101, U.S.A. $$U.S. Forest Service, Rocky Mountain Forest and Range Experiment Station, Rapid City, SD 57701, U.S.A.

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