Different animals with different diets. A mink is a carnivorous member of the weasel family that hunts fish, birds and rodents. A muskrat is a large semi-aquatic rodent that eats plants. They share habitat, which is why they are confused — and minks eat muskrats.
The core difference
- mink — Mustelidae, the weasel family. A predator: long, slim, low to the ground.
- muskrat — Cricetidae, a rodent. A herbivore: stockier, with a rat-like tail.
Telling them apart on the water
- Tail — the clearest sign. A mink's is furred and bushy; a muskrat's is scaly, nearly hairless and flattened side to side, which it uses as a rudder.
- Swimming — a muskrat swims with most of its body submerged; a mink rides higher and moves in a more darting fashion.
- Shape — a mink is elongated and low; a muskrat is rounded and compact.
Where the confusion comes from
They live in the same places: riverbanks, marshes and lake edges across North America. Both swim well, both are brown, both are roughly the same size at a glance and both are trapped for fur. A brown animal crossing a pond at dusk is not easy to identify.
The relationship between them is not neighbourly — mink prey on muskrats, and are a significant predator of them.
The other confusable
Otter — much larger, also a mustelid, with a thick tapering tail. Muskrats are sometimes mistaken for small otters and vice versa. A nutria or coypu is larger again, with a round rat-like tail and, distinctively, orange incisors.
Where the names come from
Muskrat is a folk-etymological reshaping. The animal is named for the musky secretion it uses to mark territory, but the English word comes from an Algonquian word — recorded in forms like musquash — that was reinterpreted as musk plus rat because both halves happened to make sense. Musquash survives in the fur trade.
Mink comes from Swedish mänk, and the animal has given English the shorthand for luxury: a mink coat requires many animals, which is why the word signals expense on its own.
The fur trade note
Both were central to the North American fur trade, and American mink introduced to Europe for fur farming have established feral populations, where they are an invasive predator implicated in the decline of the water vole in Britain.
Frequently asked questions
What is the difference between a mink and a muskrat?
A mink is a carnivore in the weasel family; a muskrat is a plant-eating rodent. Minks prey on muskrats.
How can you tell them apart?
The tail. A mink's is furred and bushy; a muskrat's is scaly, nearly hairless and flattened side to side for use as a rudder.
Is a muskrat actually a rat?
No. It is a rodent but not a rat, and the name is a reshaping of an Algonquian word — musquash — that happened to sound like musk plus rat.