Mech, L. D., Kuechle, V. B., Warner, D. W., and Tester, J. R. 1965. A collar for attaching radio transmitters to rabbits, hares, and raccoons. J. Wildl. Manage. 29: 898-902. Mohr, C. O. 1947. Table of equivalent populations of North American small mammals. Amer. Midl. Nat. 37: 223-249. Murie, A. 1944. The wolves of Mount McKinley, U. S. Nat. Park Serv. Fauna Ser. 5, 238 p. Nellis, C. H. 1968. Some methods for capturing coyotes alive. J. Wildl. Manage. 32: 402-405. Ohmann, L. F., and Ream, R. R. 1969 Vegetation studies in the BWCA--a brief report on plant communities. Naturalist 20(1): 20-29. Olson, Sigurd F. 1938a. Organization and range of the pack. Ecology 19: 168-170. Olson, Sigurd F. 1938b. A study in predatory relationship with particular reference to the wolf. Sci. Mon. 46: 323-336. Pimlott, D. H., Shannon, J. A., and Kolenosky, G. B. 1969. The ecology of the timber wolf in Algonquin Provincial Park. Ont. Dep. Lands and Forests Res. Rep. (Wildlife) 87, 94 p. Pulliainen, E. 1965. Studies of the wolf (_Canis lupus_ L.) in Finland. Ann. Zool. Fenn. 2: 215-259. Rausch, R. A. 1967. Some aspects of the population ecology of wolves, Alaska. Amer. Zool. 7: 253-265. Rutter, R. J., and Pimlott, D. H. 1968. The world of the wolf. 202 p. Philadelphia and N. Y.: J. B. Lippincott Co. Schenkel, R. 1947. Expression studies of wolves. Behaviour 1: 81-129. (Translation from German by Agnes Klasson.) Seal, U. S., and Erickson, A. W. 1969. Phencyclidine hydrochloride immobilization of the Carnivora and other mammals. Fed. (Symp. Lab. Anim. Anesthes.) Proc. 28: 1410-1419. Siegel, S. 1956. Non-parametric statistics for the behavioral sciences. 312 p. New York: McGraw-Hill. Stenlund, M. H. 1955. A field study of the timber wolf (_Canis lupus_) on the Superior National Forest, Minnesota. Minn. Dep. Conserv. Tech. Bull. 4, 55 p. Young, S. P. 1944. The wolves of North America, Part I. 385 p. Washington, D. C.: The Amer. Wildl. Inst. AN ANALYSIS OF THE AGE, SEX, AND CONDITION OF DEER KILLED BY WOLVES IN NORTHEASTERN MINNESOTA L. David Mech and L. D. Frenzel, Jr. The selective effect of predation on prey populations is of significance in studies of evolution and population dynamics. Selective predation can be an important agent in the process of natural selection, and it influences the extent to which predators limit the numbers of their prey. One of the predators most commonly chosen for investigating the selective effect upon prey is the wolf (_Canis lupus_). Because animals preyed upon by wolves generally are large, their remains can be more easily located and examined. It already has been established that in most areas wolves kill primarily young, old, and other inferior members of such prey populations as Dall sheep (_Ovis dalli_), moose (_Alces alces_), caribou (_Rangifer tarandus_), bison (_Bison bison_), and musk-oxen (_Ovibos moschatus_); evidence for this generalization has been summarized by Mech (1970).