Don't challenge these chonky critters to an eating contest, as they consume about a quarter of their body weight every day. North American river otters get their boundless energy from their very high metabolism, which also requires that they eat a great deal during the day. Not surprisingly, while some nibbling may have occurred, the prey was not consumed,” Sea Otter Savvy said in its posting. How Do … Researchers working in Alaska’s Katmai Coast have discovered a surprising new interaction between mammals on small islands off the coast: grizzly bears are preying on sea otters. Semiaquatic. River otters eat mostly aquatic organisms, including fish, frogs, crayfish, turtles, insects and some small mammals. ( Log Out / The excluded scared off males gather in areas that do not have much contact with female sea otters. The two breeds have different diets, where Asian small-clawed eat shellfish and crabs while smooth-coated otters prey on fish. If there was a decrease in sea urchin population, this would consequently have an adverse effect on the sea otter. As predicted by optimal foraging theory, sea otters prefer food species of high rank and replace depleted dietary items with those of next highest rank. Photos with European Otter Distribution. On land, the otters face threats from bears and coyotes. The great white will prey on the sea otter as a source of food along the north eastern coast of the Pacific Ocean. Sea Otter - The Asian sea otter is the largest subspecies, followed by the northern sea otter, leaving the southern sea otter as the smallest. Because they are not exposed to predators, and do not have to forage for prey, they are provided with environmental enrichment in their habitat to keep them entertained. River otters (genus Lutra) inhabit all types of inland waterways, as well as estuaries and marine coves. There are several other predators that the Otter has to worry about as well. “…while some nibbling may have occurred, the prey was not consumed.” (Don Henderson, Sea Otter Savvy/Newsflash) Carnivore. The 11 species often referred to as river otters are found throughout North America, South America, Europe, Africa, and Asia in freshwater ecosystems that sustain an abundance of prey such as fish, crayfish, crabs, mussels, and frogs. That will likely lead them to starvation in order to get the numbers back in balance. Otter Natural Predators Otters may look like cuddly creatures but they can also be very defensive when they feel that they are their offspring are in danger. Some predators like the great white shark may kill the otters but not feed on them. Otters in captivity are often seen juggling like this. River otters are crepuscular, meaning they are more active at … Sea otters have few natural predators in the sea due to their large size. Some of them are on land while others will try to feed on them in the water. The home range of an otter is extensive, covering as much as 50 miles. ( Log Out / Do giant otters live in a group? An otter … They are known to eat clams, mussels, crabs, octopus, sea urchins, snails, and fat innkeeper worms. Understanding the diets of predators, prey selection and their impact on prey populations is pivotal to investigations on the ecology of predator and prey species. Sea otters in general have a varied diet but research has shown that individuals tend to specialize on a few main prey species and this specialization in prey preference is passed on from mother to pup. Of course Otters aren’t the most powerful animals out there which is why they often find safety in numbers. To meet it’s high energetic and thermoregulation demands, a sea otter’s metabolic rate is 2 to 3 times that of comparatively sized mammals. River otters, of course, don’t live in a vacuum. ; Hunting for the Eurasian otter is a specialized task that calls for the use of their highly sensitive whiskers. One of the problems though is that as the other foods sources for sharks and whales continue to be depleted, they are going to eat what is readily available. Sea otters (Enhydra lutris) are not like other marine mammals. 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. Because the otter food source is easier to excavate from rocky-bottom habitats, as opposed to soft-bottom habitats, more otters tend to live in waters with rocky bottoms with access to shallow-burrowing prey. The only predator that they have to worry about is the killer whale. An otter must consume approximately 25% of its bodyweight in prey each day just to stay alive (for a 75 pound kid, that would amount to eating 75 quarter pound hamburgers every day!). The average life span for a sea otter is 15-20 years. Otters Show How Predators Can Blunt Climate Damage. Otter populations are affected by the density of prey they hunt. Sea otters eat about 25% of their weight every day, and is arguably the number one cause in sea otter deaths, when they cannot forage enough food to feed themselves. Otters that live near swamps may become food for alligators and crocodiles. Otters, like other predators, may improve the overall health of a prey species’ population by targeting the sick and weak. Sea otters are what is known as a keystone species. Sea otters are carnivores and feed on urchins, crabs, clams, mussels, snails, and chitons. The sea otter’s predator depends on where the specific sea otter lives. Upon returning to the surface, they float on their backs, with the rock on the stomachs. Some hunt Otters for the thrill of the kill. Otters were able to recall their meatball retrieving tekkers months after their first exposure to the puzzle. Humans have changed the ways in which the hunt Otters over the years. The sea otter is one of the few animals in the world that has the remarkable trait of using tools, such as rocks, in order to get at its prey. The sea otter’s teeth are adapted for crushing these prey items with their molars being broad and flat and canines rounded and blunt. In winter, some may dig up hibernating frogs. Otters also have particularly stinky poop, which even has its own name: spraints. Otters, like other predators, may improve the overall health of a prey species’ population by targeting the sick and weak. ; Hunting for the Eurasian otter is a specialized task that calls for the use of their highly sensitive whiskers. Sea otters eat about 25% of their weight every day, and is arguably the number one cause in sea otter deaths, when they cannot forage enough food to feed themselves. In this study, we observed a hand-reared European otter (Lutra lutra) foraging in the wild, in order to identify the type of prey captured by the predator. Sea otters eat sea urchins in abundance where they both occur but also prey on crabs and other crustaceans and mollusks Common predators of sea otters include various predatory marine mammals such as orcas and sea lions. However, the number of them being killed isn’t nearly the same volume as what takes place in Alaska. Watching Otters chase their prey is fun because they are so very active. For example the Alaskan Otter is protected so humans aren’t really a treat to it. Otters that live in rivers and lakes tend to be completely nocturnal, described as being crepuscular – activity peaks at dusk and dawn. … Otters have the densest fur of any animal—as many as a million hairs per square inch in places. They have an interesting method of eating their prey. Predators and Prey of the Sea Otter The sea otter’s diet includes about 40 marine species, including urchins, crabs, clams, abalones, mussels, and snails. Not all otters use tools, but sea otters use them all the time. Approximately 40,000 of them are consumed annually in this area. When cornered on land, they will fight and scratch. The sea otter diet at KEFJ is comprised of about equal proportions of mussels and clams, while in contrast, diet in KATM continues to be dominated by clams with an assortment of other, less-important prey. In this predator-prey relationship, the sea otter is the prey, and its population is directly impacted by the shark (Costa, 2011). They have a very high metabolism, so they need to eat frequently. It may take two weeks to a month for an otter to cover its territory. Read more about human-caused disturbance to sea otters under our Research tab. Sea otters will eat virtually anything they can get their little paws on. The future for Otters though is really going to depend on the balance when it comes to the predators they have.