River Otter

River Otter

Authors: Cory Davidson, Chandler North and Brianna Sheppard-Murphy

Common name:  River Otter

Scientific name: Lontra canadensis

Size:  1 to 1.4 meters in length (3.1 – 4.5 feet)


Identifying Features

The River Otter (Lontra canadensis) has a muscular body, short legs, webbed feet and rich brown fur.  The fur on their underside may be light brown to almost white.  The River Otter is three to four feet long with sharp claws, a slender body and it has a diamond shaped nose.  It weighs between 5 to 11 kg (11-25 pounds) and its thick tail is 17 to 18 inches long.

Habitat

L. candadensis is often found along the shore line of British Columbia including the Victoria area and the Gulf Islands.  They prefer marshes and wooded banks in fresh water areas but can be found along a variety of shores foraging among rocks or on sandy beaches. They create burrows around land habitats close to the water and are comfortable living in the space under docks at marinas.  River Otters stay close to the shore so they can avoid water predators.

Prey (food)

River Otters have a rapid metabolism and must hunt frequently. They eat a variety of animals including fish, clams, and frogs. They also attack beavers, and punch holes in beaver dams to collect and eat the trapped prey which include catfish, crayfish, and insects. In the ocean they often eat gunnels and pricklebacks, sculpins, and various crab species such as the Red Rock Crab (Cancer productus). They use their sharp claws to catch and eat their prey and can hold their breath under water for long periods of time using their large lungs while they are hunting.

Predators

There are a number of predators of the River Otters including bobcats and wolves and even bald eagles may take young pups. In the southern United States they are sometimes ambushed by alligators. They avoid being eaten by either fighting off the enemy or running/swimming away.

Life Cycle

River Otters breed in the winter or early spring. They can have up to three to five young pups each mating season and the pups are born blind and remain blind until five weeks of age. They can live from 13-15 years in the wild, and 20-25 years in captivity. River Otters are very playful and play games to teach their young coordination.

Photos by Lydia Young

References

Bioexpedition Publishing (2009). Otter habitat. Otter world .com.  Retrieved April 17, 2012 from otterworld.com/otter habitat.html

Forsyth, A. (1985). Mammals of the Canadian wild. Scarborough: Camden House. 

National Geographical Society (2012). North American river otter .National Geographic. Retrieved April14, 2012 from www.animals.NationalGeographic.com /animals/

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