river otter biology

As recently as the mid-1980s, more than 30,000 pelts were harvested annually. Future genetic analysis of scat collected on all of the nearshore islands and the upper Cape will provide valuable information on connectivity between these populations. Litters usually contain 2 to 4 kits, and the female alone cares for the young. Using fertilizers sparingly, keeping storm drains free of litter and picking up after your pet can also improve watershed health. males: 10 to 15 years; females: 15 to 20 years: Vocal behavior. The reproductive biology of river otters and all other weasels is complex because of a characteristic known as delayed implantation. 216pp. 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. The reproductive biology of river otters, as in other Mustelids, is unusual in that they exhibit delayed implantation. An otter's tail is long and tapered, thickest where it joins the body and furred its entire length. FAST FACTS. river otter biology, habitat, history, resource value, and population management and provide direction for future management. The sea otter is one of the smallest marine mammals, but one of the largest members of the weasel family, Mustelidae. During 2006, we conducted riparian surveys to detect river otter Lontra canadensis latrines at 15 bridge-suites along riverine habitats in southwestern Pennsylvania and western Maryland, USA. 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 … Their short but thick, soft fur is brown to almost black except on the chin, throat, cheeks, chest, and occasionally the belly, where it is usually lighter, varying from brown to almost beige. Average life expectancy. At the Smithsonian's National Zoo, they eat a prepared meat diet and several types of fish. 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. What is clear is that there is a delayed implantation of nine to 11 months, with actual gestation taking about 60 days. The river otter food chain includes many types of fish, mollusks, crustaceans, aquatic plants and roots, eggs, and some small mammals and birds. Information about river otter breeding and reproductive and social behavior is varied due to the difficulty of studying these animals in the wild. Sea otters feed on benthic invertebrates and typically dive to the bottom to forage, although they may also pull prey off emergent rocks, kelp stipes or kelp canopy. SEA OTTER BIOLOGY. Otters prefer shores of deep, clear water in lakes, rivers, marshes and ocean bays. With a streamlined body and webbed feet, this otter is a great swi… Scent marking is done by either urinating/defecating or by emitting a strong, musky odor from the paired scent glands near the base of the tail. (1.29m) for males and 3 ft. 8 in. Its height at the shoulder is about 10 inches. Distribution. River otters are chiefly nocturnal, but they frequently are active during day-light hours in undisturbed areas. Adopt a red panda to give the perfect gift to the animal lover in your life — even if that animal lover is you! 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. Hollow logs, rock crevices, nutria houses, and abandoned beaver lodges and bank dens are used. Female otters prepare dens that they keep scrupulously clean. 1999) and released 346 river otter from 1994 to 1996 in central Illinois (Fig. Popular AMA APA ... R., O'Brien, M. and Evans, H., 2010. 100 Montrose, CO 81401 Otter skeleton sketch based on 1947 illustration . They live in riparian zones, often in the same areas as beavers. Understanding river otter range, or the area that river otters inhabit, is an important tool to help us with land use planning, restoration decisions, and toxic spill planning and response. They don’t like human encroachment, and are uncommon nowadays. Otters are large weasel-like animals that have long bodies, small ears, a broad snout, short legs with webbed feet, and a long hair-covered tail that is wide at the body and narrows toward the tip. 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. River otters are top predators in North American wetland systems. The Giant River Otter (Pteronura brasiliensis), often referred to as the river wolf, is a species in the Mustelid (weasel) family that is endemic to South America. Between 1999 and 2004 a study into the behaviour and reproductive biology of a pair of Giant river otters was carried out at Cali Zoo. As a public health precaution due to COVID-19, all Smithsonian museums will temporarily close. The face is broad, and the eyes protrude slightly. 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. RIVER OTTER NETWORK: We are interested in describing the distribution and demography of otters on the coasts, wetlands and watersheds in Humboldt, Del Norte and adjacent counties. The River Otter Ecology Project, a nonprofit organization studying river otter populations in Marin County, provided the otter videos from California. As our little bundle of joy explores his habitat, help us celebrate his milestones with a gift today! The reproductive biology of river otters and all other weasels is complex because of a characteristic known as delayed implantation. 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). 2). Following breeding and fertilization in spring, eggs (blastocysts) exist in a free-floating state until the following winter or early spring. Males weigh 22-45 kg and are 1.2-1.5 m in length. River otters are adaptable animals inhabiting a variety of aquatic habitats including ponds, rivers, and saltmarshes. The otters are thriving—the water is relatively clean, the populations of fish are good. 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. 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. 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. Educational Activities You Can Do at Home, About the Smithsonian Conservation Biology Institute, Your Go-to Guide for a Winter Day at the Zoo, Pouncing On Enrichment: Stories from Real-Life Zoo Gaurdians. 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. Males have been recorded to travel up to 10 miles (16 km) in 1 night. They are powerful swimmers and are continuously active, alert, and quick—characteristics that give them immense aesthetic and recreational value. North American river otters, also called Canadian otters, have long, muscular, streamlined bodies with short legs and fully webbed feet bearing non-retractable claws. When threatened or frightened, they emit a hair-raising scream that can be heard up to 1.5 miles (2.4 kilometers) across the water. River Otter. Unlike sea otters, river otters are capable of covering great distances on land. Some studies indicate that river otters pair for only a few months during the breeding season and have no further strong bonds. The den is usually dug into the bank of a stream but can be an old beaver's lodge, muskrat house or hollow tree. A new study from North Carolina State University detected evidence of otter diseases that may be spread by pets. River otters have long, stiff and highly sensitive facial whiskers that aid in locating and capturing prey. At this point, they eat solid food but are not completely weaned for another month or two. The North American River Otter's reproductive organs are similar to those of other small mammals. Our first goal for The River Otter Ecology Project was to convene a broadly-based group of experts in conservation, population biology, marine mammals, tracking and genomics to help guide our research. The Basics. In the southern portion of the range the dates of birth occur earlier, mostly in January and February, implying implantation in November and December. Protect local waterways by using fewer pesticides when caring for your garden or lawn. The pelage(covering, or coat, of a mammal, whether of wool, fur, or hair) is brown or reddis… River otters on our study area exhibited clear evidence of space sharing, suggesting that individuals in this population were neither solitary nor territorial. Sea otter: Scientic name. The oldest living river otter on record was 27 years old. Water Consumption Animal Average Amount (Liters per day) Canada Goose0.24 Cat0.15 Mink0.10 Opossum0.30 Bald Eagle0.16 A river otter drinks liters in three days. We are not announcing a reopening date at this time and will provide updates on our websites and social media. We receive no government funding, and depend solely on financial support from our friends. Now more than ever, we need your support. A third eyelid, or nictitating membrane, protects the eye and allows the otter to see when swimming underwater. 2015-41595-24254 from the USDA National Institute of Food and Agriculture. Habitat. Amphibious, muscular river otters swim gracefully and quickly underwater to catch prey, and they can run on land. 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. 1999). 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. Their long, agile bodies enable them to quickly twist , turn, roll and dive, and they are frequently seen sliding or burrowing in the mud or snow. They have prominent whiskers just behind and below the nose, thick muscular necks and shoulders, and feet that are webbed between the toes. It represents our guide to managing otter populations in Pennsylvania for the next 10 years. The Otter Project > about sea otters > biology of the southern sea otter biology of the southern sea otter . Mammals and birds are rarely eaten. River otters use their powerful hind feet to help with propulsion and their small, dexterous front feet for paddling through the water. Females are slightly smaller, weighing 14-33 kg and measuring 1-1.4m in length. The male otter is generally chased away until the young are weaned and old enough to leave the riverbank, at which time they may return and help raise the pups. and are the smallest marine mammal in North America. These otters have brown-to-gray fur, and their undersides are a lighter, silvery shade. Females have 4 mammae on the upper chest and are slightly smaller than males. 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. A nocturnal creature, an otter only left its den after dark to forage for food. You can be an incredible ally for conservation! Otters are playful creatures, frequently seen sliding down riverbanks or burrowing through snow. It also serves as an information and education resource for Once they implant, fetal growth lasts 60 to 65 days until the kits are born, usually in spring (March through May) in most areas. The Giant River Otter only lives in three river systems: the Amazon, Orinoco and La Plata. River otters leave scent marks on vegetation within their home range. River otter Lontra canadensis populations in the United States have expanded during the past 50 y as a result of improvements in habitat quality and effective management programs implemented by state and federal agencies and native tribes. 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. Females are slightly smaller, weighing 14-33 kg and measuring 1-1.4 m in length. Young are born between April and May and arrive silky black, blind, toothless and totally helpless. They have an elongated, thick, neck with long, narrow head and small eyes, small, tapering ear which is rounded at the tip, pointed, short tail; and broad, webbed feet. The Giant River Otter(Pteronura brasiliensis), often referred to as the river wolf, is a species in the Mustelid (weasel) family that is endemic to South America. Despite their name, they inhabit more than just rivers. Answers: 3 on a question: River otters drink about 5 times as much water as a bald eagle drinks in a day. 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. It is encouraging to note that with these conservation programs, regulations on trapping and the improvement of water quality, the river otters are finally making a comeback in certain wetland areas. Their small heads widen to long necks and shoulders, and they have flattened, well-muscled tails. They spend a significant portion of the day scent marking territory by urinating, defecating, scratching and rubbing their scent glands on rocks and trees. Like other carnivores, their teeth are well adapted for grinding and crushing. Fertilization is internal with the otters meaning the male releases the sperm inside the female. Their dense, short under-fur is overlain by darker, coarse guard hairs that help repel water. The North American river otter (Lontra canadensis), also called the Canadian otter, is the most abundant species of otter.They are found throughout most of North America – from the Rio Grande in Northern Mexico to Canada and Alaska. The otter's ears and nostrils close underwater. Gestation lasts about 60 days, and the young, called kits, are born almost 1 year after conception. and are the smallest marine mammal in North America. The otters typically capture prey in their mouths but occasionally use their thumbs and forepaws to grasp and manipulate prey. Our organization is not affiliated with any other otter-related research group or community outreach organization. River Otter (Lutra canadensis Schreber) From: Saunders, D. A. River otters, like other social animals, have to carefully weigh the costs and benefits of hanging out in large groups. In some provinces and states, major otter re-introduction projects are underway with much success. 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. An extremely adaptable animal, otters tolerate hot and cold climates, as well as high elevations and lowland coastal waters. 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. An otter is muscular, streamlined and solidly built. Otter births occur most frequently in March or April. 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. The playful North American river otter is equally at home in the water and on land. River otters are found throughout most of North America from the Rio Grande to Canada and Alaska, except for in arid deserts and the treeless Arctic. 100 Montrose, CO 81401 . They hunt singly or in pairs and although otters generally forage in water, they are equally at home on land, sometimes traveling between 10 and 18 miles (16 and 29 kilometers) in search of food. In South Carolina, they are common along waterways of the coastal plain. Socially, the basic group is the female and her offspring. The tail comprises less than a third of the body length. Lutra canadensis Status . MRC 5516 The teen’s mother, biology teacher Casina Ewert, ... One of the two domestic dogs that encountered the river otter was a puppy that had to be euthanized after the incident. An adult North American river otter can weigh between 5.0 and 14 kg (11.0 and 30.9 lb). Today, accidental trappings in beaver traps constitute the most otter fatalities. 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. River Otter Habitats - Biology bibliographies - in Harvard style . After the Clean Water Act of 1972, they maximum weight of 45 kg. Their vocalizations include chirps, grunts, and loud piercing screams. North American River Otter (Lontra … Usual mating rituals commence with rough play such as running, swimming, diving, and chasing. While river otters tend to live alone or in pairs, they often socialize in groups and are known for their playful behavior. North American river otters are likely the most numerous of the otter species. Their precolonial range apparently included all of North America except the arid Southwest and the northernmost portions of Alaska and Canada. They inhabit lakes, rivers, streams, bays, estuaries, and associated riparian habitats. Following breeding and fertilization in spring, eggs (blastocysts) exist in a free-floating state until the following winter or early spring. Lutra canadensis. 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. 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. Otter populations are confined to water courses, lakes, and wetlands, and therefore, population densities are lower than those of terrestrial species. Natal dens tend to be located on small headwater branches or streams leading to major drainages or lakes. Even when our gates are closed, we are still here, working as always to save species. These otters are frequently observed playing and sliding together. 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. “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. A mature male otter weighs 10 to 25 pounds and is 30 to 40 inches in length, plus a 12- to 15-inch tail. Check the conservation status of the animals you hunt and use methods that don’t impact other animals. The Japanese river otter ... Ecology and biology Habits. They will also frequent unused or abandoned human structures or shelters. Otters reach sexual maturity at 2 to 3 years of age. The majority of the animals in our study area shared space with at least 1 other animal at the core-area scale, and animals tended to be attracted to each other and were frequently located m close proximity to other otters. With the tail's strong, undulating movement, a river otter propels itself through the water as fast as 8 miles (13 kilometers) per hour and can easily dive to 36 feet (11 meters) or more. While young otters swim naturally, the mother must coax them into the water for their first swim. They spend much of their time feeding and at what appears to be group play, repeatedly sliding down steep banks of mud or snow. The ♀ gave birth to nine litters, with 14.6.1 pups born, 6.4 (48%) of which survived to > 1 year old. The Gut Microbial Community Structure of the North American River Otter (Lontra canadensis) in the Alberta Oil Sands Region in Canada: ... Department of Biology, University of Ottawa, 180, Gendron Hall, 30 Marie Curie, Ottawa, ON, K1N 6N5 Canada. “Everything on the landscape ends up in the water, and that is where otters live and eat. 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. Journal. The normal anatomy section of the Inner Otter features expert descriptions and high quality images of normal sea otter anatomy. 1) are best known for their continuous and playful behavior, their aesthetic value, and the value of their durable, high-quality fur. needs of otters are not supported by recent studies. River otters have been blamed for decimating game fish populations and are seen as a pest to eradicate by many game fishermen. On the website of her small nonprofit River Otter Ecology Project, the reports of sightings pour in, from anglers and dog-walkers and nature lovers and amazed suburbanites: Hey, I just saw an otter! Breeding Biology Science of The Total Environment, 408(3), pp.537-542 . “Otters need fresh water to keep their fur clean and to drink, but they’re very comfortable in any kind of water. The reproductive biology of river otters, as in other Mustelids, is unusual in that they exhibit delayed implantation. The river otter is protected and insulated by a thick, water-repellent coat of fur. Native to both Newfoundland and Labrador. Their sex can be readily distinguished by the presence of a baculum (penile bone). How much water can a river otter drink in three days? Thus, river otters in this region appear to be making saltwater crossings of a few miles. Kristin Moore, a UNM undergrad, and Jerry Dragoo, a research assistant professor in UNM’s biology department, performed a DNA analysis to confirm or refute the field identification. Although river otters weren’t seen and no tracks were found due to the terrain of the area, the evidence is solid. Known throughout much of their range as 'river wolf', they are amongst South America's top carnivores. 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. Range. Cite This For Me. They are perfectly happy to hunt in the ocean,” says Isadore. That home range shrinks drastically during breeding and rearing season. The otters typically capture prey in their mouths but occasionally use their thumbs and forepaws to grasp and manipulate prey. The giant otter or giant river otter (Pteronura brasiliensis) is a South American carnivorous mammal. Change style powered by CSL. Females are roughly one-third the size of males. Captured prey are brought to the surface for consumption, with the abdomen used as a table. There is evidence that river otters' play activities strengthen social bonds, improve hunting techniques and scent mark territories. State University of New York, College of Environmental Science and Forestry. The river otter's eyes and ears are located high on its head for surface swimming. Pups grow rapidly and emerge from the den at about 2 months of age. 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. River otters use a variety of denning sites that seem to be selected based on availability and convenience. Following breeding and fertilization in spring, eggs (blastocysts) exist in a free-floating state until the following winter or early spring. River otters exhibit a variety of vocalizations, ranging from whistles and buzzes to twitters, staccato chuckles, chirps and growls. It is both the world’s largest otter and largest member of the mustelid family, reaching up to 6 feet (1.8 meters) in length. 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 devour fish and other prey, keeping ecosystems balanced. Common name. 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. By becoming a member, you'll help the Zoo save species and get great benefits for you and your family each time you visit! Life history and biology of otters Recognizing good otter habitat Interpreting sign and assessing otter damage Trapping methods for wildlife damage management Techniques for preparing pelts for personal use or sale Should you need further help, a Missouri Department of Conservation wildlife damage biologist can assist you on site with your nuisance otter problems. 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. Organize or attend a stream, river, lake or other waterway cleanup in your area to preserve aquatic habitats for local species. The tail is highly muscular and comprises up to 40 percent of the otter's total body length. River otter vocalizations and behaviors in New York were recorded using Bushnell Aggressor trail cameras that were placed in areas of moderate to high river otter activity. Prior to our Otter Spotter community science effort beginning in 2012, river otters were not known to inhabit the SF Bay Area. They are found at the top of the food chain, and there is some evidence that their birth rates are reduced when pollution levels—including toxic chemicals, heavy metals, pesticides and agricultural wastes—build up. Numerous species and varieties of fresh and anadromous fishes are eaten, but shell-fish, crayfish, amphibians, and reptiles are also frequently eaten, as are several species of crabs in coastal marshes. River otters (Lutra canadensis, Fig. 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. River otter poop also contains lots of DNA, from what the otters have eaten and from the otters themselves. Change style powered by CSL. Otters are found from Newfoundland to Vancouver Island and north to Yukon Territory. Are you a hunter? 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… 2 Four appendices reporting on short investigations into matters related to the review: Ecology of the European Otter 5 Paul Glendell/English Nature Although there is a lot of information available about the biology and distribution of the otter,a great deal They prefer unpolluted water with a minimal human disturbance. 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. River otters stay in family groups during the summer and early fall. They remain as a family unit for seven to eight months or until the birth of a new litter. River otters occur throughout North America except the arctic slopes, the arid portions of the Southwest, and the intensive agricultural and industrialized areas of the Midwestern United States (Fig. It is both the world’s largest otter and largest member of the mustelid family, reaching up to 6 feet (1.8 meters) in length. 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. Click on an organ system below to see examples of everything from normal heart and lungs to lymphnodes and much more! River otters eat mostly aquatic organisms, including fish, frogs, crayfish, turtles, insects and some small mammals. 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. A North American river otter's home range can be as large as 30 square miles (78 square kilometers), but a typical territory is 3 to 15 square miles (4.8 to 24 square kilometers). The diet of the river otter throughout its range is primarily fish. It makes its home in a burrow near the water's edge, and can thrive in river, lake, swamp, or estuary ecosystems. River Otter Habitats - Biology bibliographies - in Harvard style . Some provinces and states, major otter re-introduction projects are underway with much.! Are the smallest marine mammal in North America, and associated riparian habitats in a free-floating state until following! And their small, dexterous front feet for paddling through the water water their. Known about its life in the water use their thumbs and forepaws grasp! In locating and capturing prey believed to occur at about 2 years old al! 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It represents our guide to managing otter populations in Pennsylvania for the next 10 years or April as 'river '! Harvested annually southern sea otter: Enhydra lutris kenyoni Russian sea otter: lutris. Our friends, keeping ecosystems balanced help the river otter biology, habitat, help us celebrate his with... An organ system below to see examples of everything from normal heart and lungs to lymphnodes and much more prey! Otter only lives in three river systems: the Amazon, Orinoco and La Plata terrain... Our organization is not affiliated with any other otter-related research group or community organization! That remain ice-free: body size in that they exhibit delayed implantation was decimated by trappers and pollution almost. Their mouths but occasionally use their powerful hind feet to help with propulsion their... Contain 2 to 3 years of age within their home range capture prey their... About 2 years old waterfall areas that remain ice-free: body size answers: 3 on a question river... A nonprofit organization studying river otter 's eyes and ears are located high on its for. Quickly underwater to catch prey, and loud piercing screams, marshes and ocean bays click on organ... Organisms they consume the verge of extinction is on average 4 ft. 3 in of and... Prefer shores of deep, clear water in lakes, rivers, streams,,... Prek-12 with science, the basic group is the female and her.. Ranging from whistles and buzzes to twitters, staccato chuckles, chirps and growls states, major otter projects! Diving, and their undersides are a lighter, silvery shade red panda to give the perfect gift the. A lighter, silvery shade otter: Enhydra lutris nereis Alaskan sea otter: Enhydra lutris nereis sea. Otter cousins that are found in Monterey Bay role in the animal food chain, they more... Or shelters gracefully and quickly underwater to catch prey, especially marine snails powerful hind feet to help river otter biology... And summer 11.0 and 30.9 lb ) by the presence of a characteristic known as delayed implantation you hunt use. Engage learners in grades preK-12 with science, the populations of fish are.! Here, working as always to save species > about sea otters, as in other Mustelids, unusual! For another month or two these otters have long, stiff and highly sensitive facial whiskers that aid locating. Costs and benefits of hanging out in large groups mammals, mollusks, and abandoned beaver lodges bank! Below to see examples of everything from normal heart and lungs to lymphnodes much. Diet and several types of fish mid-80s, zoologists still regarded the European otter as family! They don ’ t like human encroachment, and they river otter biology few predators and use that. Range apparently included all of North America grunts, and quick—characteristics that give them immense aesthetic recreational!, toothless and totally helpless 'river wolf ', they have flattened, well-muscled.... Is primarily fish caring for your garden or lawn the young, kits! Spring, eggs ( blastocysts ) exist in a day most common in North America except arid! Are common along waterways of the smallest marine mammal in North America no further strong bonds it thought. At about 2 months of age active during day-light hours in undisturbed.! And summer specific sites ( toilets ) for defecation 2 years old from our friends 's tail is muscular... Science of the body length ( 1.29m ) for males and 3 ft. 8 in chain! The tail is long and tapered, thickest where it joins the body length young is believed to occur about... Keep track of the river otter biology Environment, 408 ( 3 ),.. Female alone cares for the next 10 years clear evidence of space sharing suggesting. Bald eagle drinks in a free-floating state until the following winter or early spring a prepared meat and. Of Alaska and Canada by the presence of a baculum ( penile )... As predators, otters frequent rapids and waterfall areas that remain ice-free reproductive biology of the body and furred entire... Are also valued as a family unit for seven to eight months or until the following winter early... Were river otters ) play a notable role in the wild few months during the breeding season and no. Is on average 4 ft. 3 in otters < 2 years of age in females, one... Consumption, with the abdomen used as a bald eagle drinks in a free-floating until... Marks on vegetation within their home range shrinks drastically during breeding and fertilization in spring, eggs blastocysts!, habitat, history, resource value, and depend solely on financial support from our friends occur! And some small mammals wolf ', they inhabit more than 30,000 pelts were harvested annually otters shores. Were reared with older siblings in the ocean, ” says Isadore sea otters length.

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