The muskrat has the size of a cat (about 30 cm) and weighs about 1 kg. Its fur is brownish with yellow, gray and reddish tones. The muzzle as well as the belly are often brighter than the rest of the body. The tail has a length of 20-25 cm, is flattened on the side and is almost hairless. This allows a better locomotion in water.
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The Muskrat is like the Coypu an invasive rodent that has been introduced from North America to Europe for its fur. It strongly modifies its habitat by digging burrows on the banks or eating aquatic plants. It is also a serious threat to freshwater mussels. This rodent can be distinguished from other similar species by a few characteristics such as its laterally flattened tail.