The reproductive biology of river otters and all other weasels is complex because of a characteristic known as delayed implantation. The Basics. Lutra canadensis Status . Their aquatic habitats can be both marine and fresh water: streams, rivers, lakes, ponds and marshes. 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. This work is supported by New Technologies for Agriculture Extension grant no. Oct 26, 2018 - Explore Lori Lee Rudy's board "River Otter", followed by 135 people on Pinterest. A mature male otter weighs 10 to 25 pounds and is 30 to 40 inches in length, plus a 12- to 15-inch tail. Their extirpation from many areas is believed to have been related more to poisoning by pesticides bio-magnified in fishes, and to the indirect adverse effects of water pollution on fish, their main food, than to excessive harvest. At the Smithsonian's National Zoo, they eat a prepared meat diet and several types of fish. The tail is highly muscular and comprises up to 40 percent of the otter's total body length. 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. 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. 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(); }. 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. 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 Otters prefer shores of deep, clear water in lakes, rivers, marshes and ocean bays. Cite This For Me. 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. 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… We hope you will join us in this important work. Following breeding and fertilization in spring, eggs (blastocysts) exist in a free-floating state until the following winter or early spring. Change style powered by CSL. River otters use their powerful hind feet to help with propulsion and their small, dexterous front feet for paddling through the water. river otter biology, habitat, history, resource value, and population management and provide direction for future management. Following breeding and fertilization in spring, eggs (blastocysts) exist in a free-floating state until the following winter or early spring. (1.29m) for males and 3 ft. 8 in. Are you a hunter? An extremely adaptable animal, otters tolerate hot and cold climates, as well as high elevations and lowland coastal waters. When a female otter is in her most fertile state it is referred to as estrus. The Otter Project > about sea otters > biology of the southern sea otter biology of the southern sea otter . They are powerful swimmers and are continuously active, alert, and quick—characteristics that give them immense aesthetic and recreational value. River otters have long, stiff and highly sensitive facial whiskers that aid in locating and capturing prey. 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 ♀ gave birth to nine litters, with 14.6.1 pups born, 6.4 (48%) of which survived to > 1 year old. These otters have brown-to-gray fur, and their undersides are a lighter, silvery shade. General Biology, Reproduction, and Behavior, Best Practices for Nuisance Wildlife Control Operators. Males weigh 22-45 kg and are 1.2-1.5 m in length. They weigh about 4 to 6 ounces (113 to 170 grams) at birth and measure 8 to 11 inches (20 to 28 centimeters). Female otters prepare dens that they keep scrupulously clean. It also serves as an information and education resource for 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. 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. Natal dens tend to be located on small headwater branches or streams leading to major drainages or lakes. Click on an organ system below to see examples of everything from normal heart and lungs to lymphnodes and much more! 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. With a streamlined body and webbed feet, this otter is a great swi… They usually remain together as a family group though the fall and into the winter months. 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. 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. A third eyelid, or nictitating membrane, protects the eye and allows the otter to see when swimming underwater. 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. At this point, they eat solid food but are not completely weaned for another month or two. 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! A nocturnal creature, an otter only left its den after dark to forage for food. About River Otter Ecology Project. The tail is highly muscular and comprises up to 40 percent of the otter's total body length. Otter Spotters help the River Otter Ecology Project keep track of the lively creatures, whose population was decimated by trappers and pollution. and are the smallest marine mammal in North America. They remain as a family unit for seven to eight months or until the birth of a new litter. Smithsonian’s National Zoo & Conservation Biology Institute 3001 Connecticut Ave., NW Washington, DC 20008, PO Box 37012 During the mid-80s, zoologists still regarded the European otter as a species on the verge of extinction. An adult North American river otter can weigh between 5.0 and 14 kg (11.0 and 30.9 lb). Webbing is greatly reduced on the front feet. 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. Adopt a red panda to give the perfect gift to the animal lover in your life — even if that animal lover is you! Pups grow rapidly and emerge from the den at about 2 months of age. Captured prey are brought to the surface for consumption, with the abdomen used as a table. Because they are at the top of their food chain, they have few predators. The reproductive biology of river otters and all other weasels is complex because of a characteristic known as delayed implantation. 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. Upon learning there was a need for volunteers with River Otter Ecology Project, I saw a chance to learn about the North American River Otter; not only to help chart the return of another otter species, but also, hopefully, help to prevent a recurrence of what I had observed all those years ago. Even when our gates are closed, we are still here, working as always to save species. In South Carolina, they are common along waterways of the coastal plain. Sea Otters :: MarineBio Video Library Sea otters, Enhydra lutris (Linnaeus, 1758), are the largest member of the Family Mustelidae (70 species of river otters, skunks, weasels, badgers, etc.) 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. Their webbed feet, streamlined bodies, and long, tapered tails enable them to move through water with agility, grace, and speed. Their small heads widen to long necks and shoulders, and they have flattened, well-muscled tails. As our little bundle of joy explores his habitat, help us celebrate his milestones with a gift today! 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. River otters exhibit a variety of vocalizations, ranging from whistles and buzzes to twitters, staccato chuckles, chirps and growls. The reproductive biology of river otters and all other weasels is complex because of a characteristic known as delayed implantation. 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. The tail comprises less than a third of the body length. 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. The otters are thriving—the water is relatively clean, the populations of fish are good. For many years, it was thought that the Japanese river otter was a subspecies of the Eurasian otter Lutra lutra. River Otter Habitats - Biology bibliographies - in Harvard style . Like other carnivores, their teeth are well adapted for grinding and crushing. River otters use a variety of denning sites that seem to be selected based on availability and convenience. Like other carnivores, their teeth are well adapted for grinding and crushing. They devour fish and other prey, keeping ecosystems balanced. River Otter (Lutra canadensis Schreber) From: Saunders, D. A. River otters (Lutra canadensis, Fig. They habitually use specific sites (toilets) for defecation. In other words, while some may be squeamish over the notion of trapping river otters for their hides, this activity, in a structured and regulated sense, helps to foster and reap the most robust data set for river otter population insight available. 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. Unlike sea otters, river otters are capable of covering great distances on land. Males weigh 22-45 kg and are 1.2-1.5 m in length. We are not announcing a reopening date at this time and will provide updates on our websites and social media. The river otter food chain includes many types of fish, mollusks, crustaceans, aquatic plants and roots, eggs, and some small mammals and birds. River otters usually mate in the months of March and April. A new study from North Carolina State University detected evidence of otter diseases that may be spread by pets. While river otters tend to live alone or in pairs, they often socialize in groups and are known for their playful behavior. While young otters swim naturally, the mother must coax them into the water for their first swim. Despite their name, they inhabit more than just rivers. River otters have long, stiff and highly sensitive facial whiskers that aid in locating and capturing prey. Washington, DC 20013. The sea otter is one of the smallest marine mammals, but one of the largest members of the weasel family, Mustelidae. Range. 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. 1988. River otters belong to the weasel family. Sexual maturity in young is believed to occur at about 2 years of age in females, but later in males. Once they implant, fetal growth lasts 60 to 65 days until the kits are born, usually in spring (March through May) in most areas. North American river otters are likely the most numerous of the otter species. 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. You can be an incredible ally for conservation! 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