All Canadian provinces except Prince Edward Island and 29 U.S. states have viable populations that sustain annual harvests. The most severe population declines occurred in interior regions where fewer aquatic habitats supported fewer otter populations. Water pollution and other diminution of aquatic and wetland habitats may limit distribution and pose long-term threats if the enforcement of water quality standards is not upheld. The males will often form bachelor groups, and separate from their mothers. The North American river otter is considered a species of Lemelin, Raynald Harvey, Martha Dowsley, Brian Walmark, Franz Siebel, Louis Bird, George Hunter, Tommy Myles, Maurice Mack, Matthew Gull, and Matthew Kakekaspan. OTTER KIT STEALS FROG FROM OTTER MOM? Tag: what do River Otters eat? Daily movements of family groups averaged 4.7, 4.4, and 2.4 km (2.9, 2.7, and 1.5 mi) in spring, summer, and winter, respectively. A North American river otter's main requirements are a steady food supply and easy access to a body of water. A highly active predator, the North American river otter has adapted to hunting in water, and eats aquatic and semiaquatic animals. Sea otters have an ingenious method to open shellfish. Encounters between North American river otters and beavers are not necessarily hostile. River otters do not store food or hibernate in winter. Otters are wonderfully skilled predators, who display a number of interesting behaviors and traits.It is much easier to list the habitats that river otters As with their habitats, it is also easier to list locations you cannot find otters. Otters usually forage for the slower-moving fish like carp or suckers, but once an otter has developed a taste for a specific species of fish, those are the ones it searches out. River otters (Lontra canadensis) are amphibious mammals known for their swimming ability. Today, reintroduction efforts and stricter environmental regulation aid the increasing numbers of river otters. River otters, members of the weasel family, hunt at night and feed on whatever might be available. The North American river otter, a member of the subfamily North American river otters, like most predators, prey upon the most readily accessible species. Otters living in captivity largely prefer to consume bigger fish with the size of 15 – 17 cm (5.9 – 6.7 inches).River otters also consume crustaceans such as crayfish since crayfish is relatively abundant species and is available all year round. She spent nine years working in laboratory and clinical research. Females typically are smaller. The North American river otters may compete with the North American river otters consume an extensive assortment of fish species ranging in size from 2 to 50 centimeters (0.79 to 19.69 in) that impart sufficient caloric intake for a minute amount of energy expenditure.Adult North American river otters are capable of consuming 1 to 1.5 kilograms (2.2 to 3.3 lb) of fish per day.During the winter and spring, when the water levels were higher, North American river otters had a greater tendency to prey upon crayfish (73% of scats had crayfish remains) rather than fish.Amphibians, where regionally accessible, have been found in the North American river otter's diet during the spring and summer months, as indicated in many of the food habit studies.Amphibians and reptiles are more obtainable by the North American river otter during the spring and summer as a result of breeding activity, appropriate temperatures, and water supply for the prey.Although they consume birds, North American river otters do not feed on bird eggs.Mammals are rarely consumed by North American river otters, and are not a major dietary component.Records of North American otters preying upon North American beavers (The North American river otter has few natural predators when in water. North American river otters are inadvertently harvested by traps set for North American beavers, and therefore management plans should consider both species simultaneously. North America's largest North American river otter populations were found in areas with an abundance and diversity of aquatic habitats, such as coastal marshes, the Although commonly called a "river otter", the North American river otter is found in a wide variety of aquatic habitats, both freshwater and coastal marine, including lakes, rivers, inland wetlands, coastal shorelines, marshes, and estuaries. Small mammals in the river otter food chain include mice, immature beavers and muskrats. This includes frogs, crayfish, and even crabs. Otters eat from 15% to 25% of their body weight each day. They will also consume lizards and other items they can find on land when they need to. River otters are strong, unmatched swimmers in their environments, and on land they can run at speeds up to 15 miles per hour.

Some other common items that they will eat include invertebrates, birds, and small sized animals. They are intelligent creatures that require lots of enrichment and positive reinforcement-based training to keep them happy and healthy.

The few natural river otter predators include bears, coyotes, bobcats, cougars and dogs. As the front feet make contact with the ground, the back feet are lifted and land where the front paws first contacted the ground, producing a pattern of tracks in pairs typical of most mustelids. When winter arrives, river otters will hunt under ice for food. However, playful behavior was found in only 6% of 294 observations in a study in Idaho, and was limited mostly to immature otters.Prey is captured with a quick lunge from ambush, or more rarely, after a sustained chase.
Rear leg paddling enables continuous sliding where gravity is an insufficient or an opposing force.North American river otters are highly mobile and have the capacity of traveling up to 42 km (26 mi) in one day. However, it is sensitive to pollution, and will disappear from tainted areas.Like other otters, the North American river otter lives in a holt, or den, constructed in the burrows of other animals, or in natural hollows, such as under a log or in river banks.

When the pups are about two months old and their coats grow in, their mother introduces them to the water. Fish are a favorite food, but they also eat amphibians, turtles, and crayfish.