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The North American river otter (Lontra canadensis), also known as the northern river otter or common otter, is a semiaquatic mammal endemic to the North American continent found in and along its waterways and coasts. An adult North American river otter can weigh between and 14 kg ( and lb). The river otter is protected and insulated by a thick, water-repellent coat of cunto.xyz: Mustelidae.