14 thoughts on “ Northern River Otter vs. American Mink ” Steve L. May 25, 2008 at 7:30 pm. The North American River Otter is considered to be Least Concern as it is not currently declining at a rate sufficient for a threat category. The only other otter in North America is the endangered sea otter, which occurs in seawater only along the Pacific Coast and not in Missouri. They grow to one meter (3 to 4 ft) in length and weigh from five to 15 kilograms (10 to 30 lb). The North American River Otter is very streamlined, having a muscular body with short legs, webbed toes and a long muscular tail. By the early 1900s, river otters had declined throughout large portions of their historic range in North America. General facts about North American River Otter. Lifespan: In captivity they can live up to 21 years, and in the wild 8-9 years Diet: Carnivorous Fish are the primary part of their diet The North American river otter is considered a medium to large sized otter, with adults ranging in length from 3 to 5 feet and weighing between 10 and 30 pounds. The giant otter or giant river otter (Pteronura brasiliensis) is a South American carnivorous mammal. North American river otter, Lontra canadensis, in captivity. Size: Adults can weigh between 11 and 30 lbs. Lontra (American river otters) Species: Lontra canadensis (North American river otter) Life Span: 8 – 9 years (wild) / ~21 years (zoo) Size: 2.6 – 4.3 feet (0.8 – 1.3 m) Height: 11.8 – 19.9 inches (30 – 51 cm) Weight: 11 – 31 pounds (5 – 14 kg) Fun Facts. Lontra canadensis. Boomer came to CMA to be a social partner for Walle, a rescued and non-releasable otter, who was residing by himself at that time. They play, they slide, they run, they’re social, and they create sign that is easy to distinguish from other species. Males tend to be 5% larger than females. Origin: North America Found in and along waterways and coasts. Talk about spreading out! Boomer, a North American river otter, was born in January 2018 and was transferred to CMA on October 15, 2018, from another animal care facility. The North American river otter (Lontra canadensis) became one of the major animals hunted and trapped for fur in North America after European contact. It is the longest member of the weasel family, Mustelidae, a globally successful group of predators, reaching up to 1.7 metres (5.6 ft).Atypical of mustelids, the giant otter is a social species, with family groups typically supporting three to eight members. One reason I’m sure is that as far as I know there are no wild mink in the state. The fur on their backs is generally dark brown, and their undersides vary from light brown to gray. 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