THE AUTHORS 
Laurits W. Krefting, Wildlife Research Biologist, Bureau of Sport 
Fisheries and Wildlife, U. S„ Department of the Interior, 
St. Paul, Minnesota. 
Forrest B. Lee, Wildlife Research Biologist, Northern Prairie 
Wildlife Research Center, Jamestown, North Dakota. 
Philip C. Shelton, Research Assistant, Department of Forestry and 
Conservation, Purdue University, Lafayette, Indiana. 
Karl T. Gilbert, formerly Park Ranger, Isle Royale National Park, 
presently Superintendent, Cape Hatteras National Seashore, 
Manteo, North Carolina. 
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