This study was supported by Macalester College, the U.S. Bureau of Sport Fisheries and Wildlife, the USDA Forest Service, the Minnesota Department of Conservation, and the New York Zoological Society. Special thanks are due the following for their help and cooperation with this project: Mr. J. O. Wernham, former Supervisor, Mr. L. T. Magnus, Wildlife Biologist, numerous District Rangers, and other supporting personnel of the Superior National Forest, Mr. J. T. Morgan, North Central Forest Experiment Station; and Mr. S. E. Jorgensen and Mr. C. E. Faulkner, U.S. Bureau of Sport Fisheries and Wildlife. Drs. C. T. Cushwa, L. F. Ohmann, Catherine Ream, and D. G. Schneider aided in the field work. Mr. W. W. Cochran provided advice and suggestions on the radiotracking technique, Dr. U. S. Seal furnished the drugs and the advice on their use with wolves, and Mr. R. Himes contributed significantly in the wolf trapping. Mr. L. Ringham, Ontario Department of Lands and Forests, granted permission for research personnel to radiotrack wolves crossing into Quetico Park, Canada. Numerous students from Macalester College also contributed to the field effort. Thanks are also due pilots Robert Hodge, Pat Magie, Ken Bellos, Don Murray, Jack Burgess, and several others, who along with pilot-biologist John Winship, expertly flew the aircraft used in the study. This report was reviewed by the following biologists: Mr. G. B. Kolenosky, Dr. P. A. Jordan, Mr. M. H. Stenlund, and Dr. D. L. Allen. Mr. Wallace C. Dayton, Miss Elizabeth Dayton, and the Quetico-Superior Foundation, all of Minneapolis, generously contributed funds to support Mech during the preparation of the paper. LITERATURE CITED Burkholder, B. L. 1959. Movements and behavior of a wolf pack in Alaska. J. Wildl. Manage. 23: 1-11. Erickson, A. B., Gunvalson, V. E., Stenlund, M. H., Burcalow, D. W., and Blankenship, L. H. 1961. The white-tailed deer of Minnesota. Minn. Dep. Conserv. Tech. Bull. 5, 64 p. Fuller, W. A., and Novakowski, N. S. 1955. Wolf control operations, Wood Buffalo National Park, 1951-1952. Can. Wildl. Serv., Wildl. Manage. Bull. Ser. 1, No. 11, 23 p. Goldman, E. A. 1944. The wolves of North America, Part II. Classification of wolves, p. 389-636. Washington, D. C.: The Amer. Wildl. Inst. Jordan, P. A., Shelton, P. C., and Allen, D. L. 1967. Numbers, turnover, and social structure of the Isle Royale wolf population. Amer. Zool. 7: 233-252. Kelly, M. W. 1954. Observations afield on Alaskan wolves. Alaska Sci. Conf. Proc. 5: 35 (and mimeo). Kolenosky, G. B., and Johnston, D. H. 1967. Radio-tracking timber wolves in Ontario. Amer. Zool. 7: 289-303. Mech, L. D. 1966a. The wolves of Isle Royale. U. S. Nat. Park Serv. Fauna Ser. 7. 210 p. Mech, L. D. 1966b. Hunting behavior of timber wolves in Minnesota. J. Mammal. 47: 347-348. Mech, L. D. 1970. The wolf: the ecology and behavior of an endangered species. 389 p. New York: Natural History Press, Doubleday.