The Muskrat (Ondatra zibethicus), the only species in genusOndatra, is a large rodent native to North America, and introduced in parts of Europe. Adult body length is usually between 25-40cm long, with a strong, laterally compressed tail 20-25cm long. The weight is up to 1700g, about four times the weight of a Brown Rat.
They live in wetlands: ponds, lakes and river banks, and are very good swimmers, using their tail for propulsion in the water. Extensive burrow systems are dug in the ground adjacent to the water.
