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The neotropical otter or neotropical river otter ("Lontra longicaudis") is an otter species found in Middle America, South America, and the island of Trinidad. It is physically similar to the northern and southern river otter, which occur directly north and south of this species' range. The length of the neotropical otter can range from , plus a tail of . Body weight ranges from . Otters are members of the family Mustelidae, the most species-rich (and therefore diverse) family in the order Carnivora.