This page has information aobut how to tell the difference between beavers, muskrats and nutria. Otter are carnivores, feeding on fish, crayfish, frogs, insects, small mammals, mollusks, and blue crabs.

River otters are semiaquatic mammals, known for their playful behavior.

Crystal Springs Creek Community Partnership.

It's also a species of management concern for some landowners. Life Creekside

Nutria are frequently mistaken for beaver, muskrat, groundhog, and otter.

Typical total length for this species is from 39 to 47 inches, and the large flat tail varies from 10 to 13 inches long and from 3.5 to 8 inches wide. The mountain beaver is considered a living fossil, due to the presence of a host of primitive characteristics, particularly the protrogomorphous zygomasseteric system. Tail is hairy and round (not compressed from side to side) and pointed at the tip, Hind legs are much longer than the front legs, giving them a hunched appearance when on land, Floating platforms up to three feet high that they make from aquatic vegetation, Burrows in vegetated banks near waterways and collapsing banks and road beds, Oregon Department of Fish and Wildlife, Living with Beaver, Portland State University Report on Nutria Management. March 2018

October 2014 Creates beds of cut vegetation.

An adult weighs about 3 to 4 pounds.Young muskrats reproduce after 10 to 12 months. When pursued, nutria can swim long distances under water and see well enough to evade capture.

Also digs softball-sized bank dens. They are larger than muskrats and smaller than beaver.Adult nutria can weigh up to 20 pounds with total length of about 3 feet. It can be hard to see, but it’s a good way to distinguish the two. The tail is a distinctive identifier of this species because it is rat like, but flattened from side to side, rather than round.

2018 The nutria (which is called by the common name coypu in Latin America) is generally similar in appearance to the beaver, with the obvious exception of the tail, which is thin, scaly and ratlike, as opposed to the beaver's flattened paddle-like tail.

Sometimes digs volley ball-sized bank dens at water's edge.

Nutria have round rat like tails, muskrat have a triangular shaped tail in cross section. Nutria have short legs and a robust, highly arched body that is approximately 24 inches long.

This is the first of a three part series, looking at beaver and nutria, rats and voles, and deer and elk in the local habitat. September 2016 Events November 2016 December 2011 September 2011

In the protrogomorphous condition, the masseter muscle does not pass through the infraorbital foramen as it does in guinea pigs and mice.

Crystal Springs Nutria have short legs and a robust, highly arched body that is approximately 24 inches long. Skip to Article. Wildlife. Of course nutria a noticeably larger than muskrats, are much less secretive and are easily observed in daylight where they occur. October 2015 The groundhog typically measures 16 to 26 inches long, including a 6-inch tail and weighing 4 to 9 lbs.

Beaver, Muskrat and Nutria Identification. Nutria, or coypu, (Myocastor coypus) are a large, stout-bodied animals that can be easily confused with other species.With careful observation, nutria can be positively identified in the field. The American beaver is a native mammal that plays an important ecological role in our watersheds.

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