While they are both rodents and share some superficial similarities (like being semi-aquatic), nutria (also known as Coypu) belong to the family Myocastoridae, while muskrats belong to the family Cricetidae.
Here's a breakdown:
* Nutria (Myocastoridae): This family only contains the single species, the nutria. They are native to South America and were introduced to other areas, including the United States.
* Muskrat (Cricetidae): This family is much larger, containing many different rodents, including voles, hamsters, gerbils, and lemmings. Muskrats are native to North America and parts of Eurasia.
While they may look similar, they are distinct animals belonging to different families.