Typically such dens are makeshift, from log piles or similar natural sources, but often they will use former beaver or nutria dens as well. The North American beaver is a large, semi-aquatic rodent. River otters can live up to about 10 years in the wild. IUCN Otter Specialist Group Bulletin: Prey Preference of the North American River Otter (Lontra Canadensis) Evaluated Based on Optimal Foraging Theory. The river otter food chain consists mostly of fish. However, their habits change slightly when winter comes. Though some fish become sluggish, brown trout face relatively few changes. They enjoy carp, sunfish, minnows, suckers, sculpin and salmonids such as: River otters also prefer slower-moving fish to game fish. Photodisc/Photodisc/Getty Images. Grizzlies hibernate during the winter months, and in order to sustain themselves during this time, they need to eat a lot in the fall. They will even slide across the ice to get from one place to another. The river otter food chain also includes aquatic plants and roots. When cornered on land, they will fight and scratch. They even appear to enjoy the icy season by frolicking and remaining active. River otters reach sexual maturity at two years. River otters help thin invasive species and protect biodiversity. Otters are semi-aquatic animals that do not hibernate. River otters belong to the weasel family. They can dive up to 250 feet and remain in water for up to four minutes. Kay Curtis began writing professionally in 1988. Unlike bears, they do not hibernate in winter; rather they may sleep for several consecutive days.
River otters (Lontra canadensis) are amphibious mammals known for their swimming ability. Their high metabolisms result in rapid food digestion. During the summer, the swans inhabit shallow ponds, lakes, and rivers in northern Canada. Their homes are called "holts" and are similar to burrows. What is the 5,000 Miles of Wild Campaign? Otters are nocturnal creatures, but they become diurnal in winter, becoming active during the day and sleeping at night. Litter size may compose of 3 – 5 young (1 – 3 being an average). Besides hunters, otters' food sources are often compromised by fishermen depleting their supply. River otters eat a variety of aquatic wildlife, such as fish, crayfish, crabs, frogs, birds’ eggs, birds and reptiles such as turtles. Otter Dens. River otters are apex predators in their food web. Their facial whiskers help them catch prey by sending vibrations as they float in the water. North American river otters are semiaquatic mammals that do not hibernate when winter comes around. Habitat loss and water pollution also took detrimental tolls on river otters. PART OF WILD SKY MEDIA | FAMILY & PARENTING, International Union for Conservation of Nature. Wiki User Answered . Curtis has a Bachelor of Science in journalism from Texas A&M University. The fat layer underneath their skin protects them from cold temperatures. What’s your favorite animal during the winter?
These have hidden, underwater entrances for protection from predators, which makes them attractive to otters. Generally solitary, river otters do engage in play when they meet. A primary food source for the bears is fish, and they spend a lot of time hunting salmon, trout, and bass.
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