River Otter

The river otter is a semiaquatic mammal in the weasel family, best known in North America as the North American river otter (*Lontra canadensis*).

The river otter is a semiaquatic mammal in the weasel family, best known in North America as the North American river otter (Lontra canadensis). It lives in and around freshwater and coastal habitats, where it hunts fish and other aquatic animals. The species is widespread across much of North America and is listed as Least Concern by the IUCN.

Description

River otters are stocky, streamlined members of the weasel family with short legs, inconspicuous ears, and a strong tail. Their dense fur and aquatic body shape help them swim efficiently and stay warm in cold water. Adults typically measure about 102–152 cm (40–60 in) in length and weigh between 6.8–15 kg (15–35 lb).

Habitat and range

North American river otters live along rivers, streams, lakes, marshes, wetlands, and coastal areas. Their range covers most of North America north of Mexico, including much of Canada and Alaska. River otters are native to Canada and occur across much of the country, including Newfoundland and Labrador and areas from the Atlantic to the Pacific and north to Yukon Territory.

Diet and behaviour

River otters are carnivores that hunt mostly aquatic prey such as fish, crayfish, frogs, and insects. They also eat amphibians, crayfish, insects, and small mammals. They are strong swimmers and may travel over land between waterways when needed.

Conservation

The species is listed as Least Concern globally, but local populations have declined in some areas due to habitat loss, water pollution, and trapping or entanglement in fishing gear. Conservation and reintroduction efforts have helped recover populations in some regions.