The otters typically capture prey in their mouths but occasionally use their thumbs and forepaws to grasp and manipulate prey. Following breeding and fertilization in spring, eggs (blastocysts) exist in a free-floating state until the following winter or early spring. Known throughout much of their range as 'river wolf', they are amongst South America's top carnivores. Following breeding and fertilization in spring, eggs (blastocysts) exist in a free-floating state until the following winter or early spring. The tail is highly muscular and comprises up to 40 percent of the otter's total body length. Females are about 25 percent smaller than males. 2). North American river otters are known for their playful swimming, but they are also an important species for helping scientists understand the health of river systems. They live in riparian zones, often in the same areas as beavers. How much water can a river otter drink in three days? By comparing the Mitochondrial Cytochrome b Gene of a mummified Japanese river otter corpse with Eurasian otters from Latvia and China, it was proven that t… Order: Carnivora Family: Mustelidae With the demise of the wolverine (Gulo luscus Linnaeus) in the Adirondacks in the late 1700’s or early 1800’s, the river otter became the region’s largest member of the weasel family. Stealing of prey from another otter sometimes occurs, most typically males stealing from females. 2 3 Boyle, S. (2006, September 2). They are perfectly happy to hunt in the ocean,” says Isadore. “Everything on the landscape ends up in the water, and that is where otters live and eat. 2015-41595-24254 from the USDA National Institute of Food and Agriculture. Otter births occur most frequently in March or April. The North American river otter (Lontra canadensis), also known as the northern river otter or common otter, is a semiaquatic mammal endemic to the North American continent found in and along its waterways and coasts. 216pp. River otters are adaptable animals inhabiting a variety of aquatic habitats including ponds, rivers, and saltmarshes. The Giant River Otter only lives in three river systems: the Amazon, Orinoco and La Plata. For years, river otters have been hunted for their fur, and their pelts are still an important source of income for many people in Canada. When a female otter is in her most fertile state it is referred to as estrus. Vegetative cover and altitude do not appear to influence the river otter’s distribution as much as do good or adequate water quality, the availability of forage fish, and suitable denning sites. “Everything runs to the rivers,” said Chris DePerno, co-author of the study and a professor in NC State’s Fisheries, Wildlife and Conservation Biology Program. Lutra canadensis Status . The otters are thriving—the water is relatively clean, the populations of fish are good. river otter biology, habitat, history, resource value, and population management and provide direction for future management. Webbing is greatly reduced on the front feet. The river otter Lontra canadensis is an elusive species that can serve an important role in aquatic ecosystems as a top predator of fish and crayfish. The loss of ponds and other wetland habitat that resulted from the extirpation of beaver in the late 1800s may have adversely affected continental populations of river otters more than any other factor. Recent releases totaling more than 1,000 otters have been made in Arizona, Colorado, Iowa, Kansas, Kentucky, Missouri, Nebraska, Oklahoma, Pennsylvania, Tennessee, and West Virginia in efforts to reestablish local populations. River otters use a variety of denning sites that seem to be selected based on availability and convenience. You can be an incredible ally for conservation! The River Otter Ecology Project is a registered 501 (c)(3) EIN #45-4997526 non-profit organization dedicated to the welfare of river otters and our watershed. Natal dens tend to be located on small headwater branches or streams leading to major drainages or lakes. The River Otter Ecology Project, a nonprofit organization studying river otter populations in Marin County, provided the otter videos from California. The pelage(covering, or coat, of a mammal, whether of wool, fur, or hair) is brown or reddis… Once they implant, fetal growth lasts 60 to 65 days until the kits are born, usually in spring (March through May) in most areas. Their webbed feet, streamlined bodies, and long, tapered tails enable them to move through water with agility, grace, and speed. The fertilized eggs float around in the uterus for about 9 months before implantation occurs, rather than implanting on the uterine wall shortly after fertilization. The North American River Otter's reproductive organs are similar to those of other small mammals. Following breeding and fertilization in spring, eggs (blastocysts) exist in a free-floating state until the following winter or early spring. Popular AMA APA ... R., O'Brien, M. and Evans, H., 2010. Regionally extinct throughout the Midwest and heavily populated areas in the east, several states have recently begun reintroduction programs. Adirondack Mammals. They have long, streamlined bodies, short legs, and a robust, tapered tail, all of which are well adapted to their mostly aquatic habitat. The oldest living river otter on record was 27 years old. FAST FACTS. Research based wildlife control information, River Otters | River Otter Overview | River Otter Damage Assessment | River Otter Damage Management | River Otter Resources | River Otter Acknowledgments | ICWDM | Wildlife Species Information, if (window.showTocToggle) { var tocShowText = "show"; var tocHideText = "hide"; showTocToggle(); }. They will also frequent unused or abandoned human structures or shelters. Its height at the shoulder is about 10 inches. They are powerful swimmers and are continuously active, alert, and quick—characteristics that give them immense aesthetic and recreational value. California sea otter: Enhydra lutris nereis Alaskan sea otter: Enhydra lutris kenyoni Russian sea otter: Enhydra lutris lutris: Body size. As a public health precaution due to COVID-19, all Smithsonian museums will temporarily close. These otters have brown-to-gray fur, and their undersides are a lighter, silvery shade. North American river otters are known for their playful swimming, but they are also an important species for helping scientists understand the health of river … They spend a significant portion of the day scent marking territory by urinating, defecating, scratching and rubbing their scent glands on rocks and trees. They don’t like human encroachment, and are uncommon nowadays. Otters are found from Newfoundland to Vancouver Island and north to Yukon Territory. Thus, river otters in this region appear to be making saltwater crossings of a few miles. The male reproductive system contains a penis, testes, scrotum and more while the female reproductive system contains a vagina, ovaries, etc. Seasonally, they may travel distances of 50 to 60 miles (80 to 96 km) along streams or lake shores, and their home ranges may be as large as 60 square miles (155 km2). Fertilization is internal with the otters meaning the male releases the sperm inside the female. A third eyelid, or nictitating membrane, protects the eye and allows the otter to see when swimming underwater. Because they have a low tolerance for polluted water, river otters are considered by some naturalists to be a good indicator, or "keystone," species of the quality of aquatic habitats. When Andrew Rutter took a full-time wildlife ecologist position at the Lake County Forest Preserves in 2017, he expected his work studying river otter ecology would come to an end. The reproductive biology of river otters and all other weasels is complex because of a characteristic known as delayed implantation. Adult river otters weigh 10 to 33 pounds (4.5 to 15 kilograms) and are about 2.5 to 5 feet (76 to 152 centimeters) in length. They occur at much higher densities in regions of the Great Lakes, in brackish marshes and inlets, and in other coastal habitats than farther inland. Usual mating rituals commence with rough play such as running, swimming, diving, and chasing. The giant otter or giant river otter (Pteronura brasiliensis) is a South American carnivorous mammal. River Otter. river otter biology, habitat, history, resource value, and population management and provide direction for future management. As of 2016, ROEP has catalogued more than 1,730 sightings and added to that tally close to 5,000 camera-trap videos and photos and roughly 1,300 samples of otter scat. As prey, otters provide a great source of nutrients to animals that hunt them for food. Density & Home Range Size. 1988. Change style powered by CSL. An otter is muscular, streamlined and solidly built. Their vocalizations include chirps, grunts, and loud piercing screams. River Otter Habitats - Biology bibliographies - in Harvard style . The tail comprises less than a third of the body length. Socially, the basic group is the female and her offspring. A nocturnal creature, an otter only left its den after dark to forage for food. Smithsonian’s National Zoo & Conservation Biology Institute 3001 Connecticut Ave., NW Washington, DC 20008, PO Box 37012 SEA OTTER BIOLOGY. River otter were listed as endangered by the state of Illinois in 1989, with relict populations occurring in northwestern Illinois and extreme southern Illinois (Anderson 1995).The state recovery team, formed in 1993, developed a reintroduction program (Bluett et al. Amphibious, muscular river otters swim gracefully and quickly underwater to catch prey, and they can run on land. 100 Montrose, CO 81401 Webbing is greatly reduced on the front feet. Not only are we seeing the return of the River otter to many areas, but also that it is possible for humans and otters, to co-exist in the same areas. (1.29m) for males and 3 ft. 8 in. River otters stay in family groups during the summer and early fall. Society for Conservation Biology North American River Otter (Lontra canadensis): A Technical Conservation Assessment Prepared for the USDA Forest Service, Rocky Mountain Region, Species Conservation Project September 2, 2006 Steve Boyle BIO-Logic Environmental 635 East Main Ste. River otters have been blamed for decimating game fish populations and are seen as a pest to eradicate by many game fishermen. Otters prefer shores of deep, clear water in lakes, rivers, marshes and ocean bays. Because of the availability of abundant alternate food species in warm water, losses of the warm water sport fishes are believed minor compared to losses river otters can inflict on cold water species such as trout and salmon. Different studies have placed the breeding season in winter, late spring and summer. The reproductive biology of river otters, as in other Mustelids, is unusual in that they exhibit delayed implantation. River otters usually mate in the months of March and April. River otters use their powerful hind feet to help with propulsion and their small, dexterous front feet for paddling through the water. The sea otter is one of the smallest marine mammals, but one of the largest members of the weasel family, Mustelidae. Description. The Giant otter, living in South America, and the largest of the otters in its total length, is the cousin of the sea and river otters in North America, Europe and Africa. needs of otters are not supported by recent studies. River otters (Lutra canadensis, Fig. Popular AMA APA (6th edition) APA (7th edition) Chicago (17th edition, author-date) Harvard IEEE ISO 690 MHRA (3rd edition) MLA (8th edition) OSCOLA Turabian (9th edition) Vancouver. River otters are top predators in North American wetland systems. Organize or attend a stream, river, lake or other waterway cleanup in your area to preserve aquatic habitats for local species. The den is usually dug into the bank of a stream but can be an old beaver's lodge, muskrat house or hollow tree. Their aquatic habitats can be both marine and fresh water: streams, rivers, lakes, ponds and marshes. Males weigh 22-45 kg and are 1.2-1.5 m in length. Biology of the North American river otter Adult river otters weigh between 15 and 30 pounds and measure 84.34 cm (2.8 feet) to 137.16 cm (4.5 feet).1,2 Otters have adapted to their aquatic environment by de-veloping dense fur, large lungs, and webbed hind feet. During the mid-80s, zoologists still regarded the European otter as a species on the verge of extinction. MRC 5516 The otter's ears and nostrils close underwater. With a streamlined body and webbed feet, this otter is a great swi… They devour fish and other prey, keeping ecosystems balanced. Adopt a red panda to give the perfect gift to the animal lover in your life — even if that animal lover is you! Their precolonial range apparently included all of North America except the arid Southwest and the northernmost portions of Alaska and Canada. The Basics. Adult males usually attain lengths of nearly 48 inches (122 cm) and weights of about 25 pounds (11.3 kg), but may reach 54 inches (137 cm) and 33 pounds (15 kg). In their role as predators, otters help regulate the local population of the organisms they consume. Protect local waterways by using fewer pesticides when caring for your garden or lawn. The ♀ gave birth to nine litters, with 14.6.1 pups born, 6.4 (48%) of which survived to > 1 year old. Washington, DC 20013. otter biology and history ^ Otters were once plentiful across most of North America but due to trapping pressure in the late 1800’s and early 20th century, these numbers dwindled. Consumption of game fishes in comparison to nongame (rough) fishes is generally in proportion to the difficulty, or ease, with which they can be caught. The tail is highly muscular and comprises up to 40 percent of the otter's total body length. In the southern portion of the range the dates of birth occur earlier, mostly in January and February, implying implantation in November and December. 100 Montrose, CO 81401 . By 1977, the river otter was included as an Appendix II species under the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) - not necessarily for the river otter’s sake, but more so for that of similar species with endangered status, whom officials feared would be inadvertently targeted by the fur trade in a case of mistaken identity. Click on an organ system below to see examples of everything from normal heart and lungs to lymphnodes and much more! Tools, commonly rocks, may be used by some individuals to break into hard-shelled prey, especially marine snails. Female otters prepare dens that they keep scrupulously clean. Otter Spotters help the River Otter Ecology Project keep track of the lively creatures, whose population was decimated by trappers and pollution. Like other carnivores, their teeth are well adapted for grinding and crushing. Range. Sea otters, Enhydra lutris (Linnaeus, 1758), are the largest member of the Family Mustelidae (70 species of river otters, skunks, weasels, badgers, etc.) North American river otters are likely the most numerous of the otter species. Pups grow rapidly and emerge from the den at about 2 months of age. The Otter Project > about sea otters > biology of the southern sea otter biology of the southern sea otter . Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture. Research done in the early 1990s by the Department of Biology of Kochi University in Japan revealed some interesting facts about the genes of the Japanese River Otter. North American river otters, also called Canadian otters, have long, muscular, streamlined bodies with short legs and fully webbed feet bearing non-retractable claws. Check the conservation status of the animals you hunt and use methods that don’t impact other animals. In response to this drop in population, regulations were put in place to reduce the amount being lost to … River otters leave scent marks on vegetation within their home range. Information about river otter breeding and reproductive and social behavior is varied due to the difficulty of studying these animals in the wild. River otters belong to the weasel family. Otter fur is a rich, dark brown and is lighter on the … Claiming a territory about ten miles in diameter, it marked the area with its droppings about one to three miles apart and sets up three or four nests under rocks or inside bushes. Biology of the North American river otter Adult river otters weigh between 15 and 30 pounds and measure 84.34 cm (2.8 feet) to 137.16 cm (4.5 feet).1,2 Otters have adapted to their aquatic environment by de-veloping dense fur, large lungs, and webbed hind feet. The river otter (Lontra canadensis) is widely distributed across North America, from Florida to Alaska, and this large mustelid (weasel family) occupied every major waterway of the United States and Canada until at least the nineteenth century.By 1977, however, they occupied < 75% of their historic range due to draining of wetlands, overharvesting for fur, and pollution. Food. While river otters tend to live alone or in pairs, they often socialize in groups and are known for their playful behavior. Sexual maturity in young is believed to occur at about 2 years of age in females, but later in males. At the center of the range in California, sea otters spend 40-50% of each 24-hr period foraging, although in more recently occupied areas at the edge of the range they may feed as little as 20% of the time. Litters usually contain 2 to 4 kits, and the female alone cares for the young. 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 Giant River Otter only lives in three river systems: the Amazon, Orinoco and La Plata. Provided it survives its first year of life, a typical North American river otter will live to the age of 12, with some surviving longer. Hollow logs, rock crevices, nutria houses, and abandoned beaver lodges and bank dens are used. That home range shrinks drastically during breeding and rearing season. Females are roughly one-third the size of males. maximum weight of 45 kg. Otters (both sea and river otters) play a notable role in the animal food chain. The reproductive biology of river otters and all other weasels is complex because of a characteristic known as delayed implantation. 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