Ondatra zibethicus, commonly known as the muskrat, is native to North America. Its native geographical distribution includes most of Canada and the United States, extending from Alaska and northern regions of Canada down to northern parts of Mexico.

Muskrats predominantly inhabit wetlands, such as marshes, swamps, and along riverbanks and lakeshores. They are typically found in areas with abundant aquatic vegetation that provides both food and shelter. The climate in these areas varies considerably, from colder northern regions to milder southern areas, but muskrats are adapted to seasonal changes.

Muskrats play an important ecological role in their habitat, primarily as herbivores. They consume a wide range of aquatic vegetation such as cattails, water lilies, and various pondweeds. By feeding on and manipulating vegetation, they help maintain wetland ecosystems. Muskrats often share their habitat with other species like beavers, but they niche differently by primarily building lodges and burrows in banks.