They grow to one meter (3 to 4 ft) in length and weigh from five to 15 kilograms (10 to 30 lb). Talk about spreading out! 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. Learn the basics of river otter tracks and sign in this article, so you can track them in the wild. Size : Total length: 35½ to 53 inches; weight: 10–30 pounds. A river otter… The North American river otter (Lontra canadensis) became one of the major animals hunted and trapped for fur in North America after European contact. 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. North American river otter, Lontra canadensis, in captivity. River otters eat a variety of fish and shellfish, as well as small land mammals and birds. They play, they slide, they run, they’re social, and they create sign that is easy to distinguish from other species. 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 fur on their backs is generally dark brown, and their undersides vary from light brown to gray. The giant otter or giant river otter (Pteronura brasiliensis) is a South American carnivorous mammal. The North American river otter (Lontra canadensis) is a semiaquatic mammal in the weasel family.While it may simply be called the "river otter" in North America (to distinguish it from the sea otter) there are other river otter species throughout the world. One reason I’m sure is that as far as I know there are no wild mink in the state. 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 Here in Oregon that critter is an otter. 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. The North American River Otter is very streamlined, having a muscular body with short legs, webbed toes and a long muscular tail. 14 thoughts on “ Northern River Otter vs. American Mink ” Steve L. May 25, 2008 at 7:30 pm. General facts about North American River Otter. Origin: North America Found in and along waterways and coasts. Lontra canadensis. The body of the river otter measures between 65 cm to 105 cm (25 to 41 inches) in length and the tail measures 32 to 45 cm (12 to 17 inches) in length. 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. 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