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- [3] ESTRUS AND THE VAGINAL SMEAR CYCLE OF THE RIVER OTTER, LUTRA-CANADENSIS JOURNAL OF REPRODUCTION AND FERTILITY, 1988, 83 (02): : 605 - 610
- [4] RIVER OTTER (LUTRA-CANADENSIS) ON NORTH SLOPE OF BROOKS RANGE, ALASKA CANADIAN FIELD-NATURALIST, 1977, 91 (03): : 303 - 305
- [8] AN INCIDENT OF WOLF, CANIS-LUPUS, PREDATION ON A RIVER OTTER, LUTRA-CANADENSIS, IN MINNESOTA CANADIAN FIELD-NATURALIST, 1991, 105 (04): : 567 - 568
- [9] A POSSIBLE METHOD FOR ESTIMATING RIVER OTTER, LUTRA-CANADENSIS, POPULATIONS USING SNOW TRACKS CANADIAN FIELD-NATURALIST, 1987, 101 (04): : 576 - 580