Abstract
Food items were identified in digestive tracts from otters (Lutra canadensis) taken by trappers during February, March, and April over a period of 6 years in Wisconsin, Michigan, and Minnesota. In addition, scats of Wisconsin otters from all seasons of the year were examined for food remains. Fish, particularly non-game fish, were the main prey species. Game fish (including trout) occurred infrequently. Crayfish, frogs, and aquatic insects were other important foods. In the early 1950's some Wisconsin sportsmen were vociferously condemning the otter as a destroyer of trout and other game fish. A second public faction maintained that otters were not destructive and should be completely protected from trapping. To evaluate these charges, an investigation of otter food habits in Wisconsin was under-
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