A North American aquatic fur-bearing rodent (Fiber
   zibethicus). It resembles a rat in color and having a long scaly tail,
   but the tail is compressed, the bind feet are webbed, and the ears are
   concealed in the fur. It has scent glands which secrete a substance
   having a strong odor of musk. Called also musquash, musk beaver, and
   ondatra.