Mink vs Otter
Verdict: Size is the quickest tell. A mink tops out near 3 pounds and looks like a long brown weasel, while a river otter is 10 to 30 pounds with a thick, tapering tail and a broad whiskered face.
Both animals are dark brown, both swim, and both show up along streams, lakes, and marshes, so a quick glimpse can fool you. Most sightings in North America are the American mink or the North American river otter, two members of the weasel family that live in similar places.
The gap between them is bigger than it first looks. An adult otter can weigh ten times what a mink does, and the body shape, tail, and face all differ. This page lists the clues that hold up in the field and tells you which ones to check first.
Mink vs Otter side by side
| Trait | Mink | River otter |
|---|---|---|
| Adult weight | About 1.5 to 3.5 lb | About 10 to 30 lb |
| Body length | About 21 to 27 in | About 35 to 53 in |
| Tail | Long, with no obvious thick base and little taper | Long, thick at the base, tapering to a point |
| Feet | Only slight webbing between the toes | Fully webbed |
| Face and fur | Nearly all brown with a white chin and irregular white spots | Dark brown with paler belly and a silvery muzzle |
| Head and whiskers | Small, pointed, flat-looking face | Broad head with long, prominent whiskers |
| Main food | Mice, rabbits, fish, crayfish, frogs | Mostly fish, plus crayfish, frogs, turtles |
| Social life | Not described as traveling in groups | Often seen in family groups, plays and slides |
| Smell | Strong musk, worst in breeding season | Not described as musky |
| Time of day | Mostly night, peaks at dawn and dusk | Mostly night, active year round |
Last verified October 2026. Typical values; individual animals, products and local prices vary.
When you are looking at which
Mink
- The animal is small and slim, closer to a ferret than a dog, and is on its own.
- You notice a white chin or small white patches on the throat or belly.
- It hunts or hauls prey on land, such as mice or rabbits, near the water.
- The tail is about the same thickness from base to tip and barely narrows.
River otter
- The animal is large, long, and heavy, with a body about the size of a small dog.
- You see a thick tail that narrows to a tip, like a rope tapering off.
- Two to four animals travel together and tumble, dive, or slide on mud or snow.
- The head looks broad and whiskery with a silvery muzzle.
How this works
The quiz scores each answer toward one animal and counts how many cues agree. Size, tail shape, and chin color are the most reliable, while group behavior is a supporting clue only. Answer only what you actually saw, and pick I can't tell for the rest, since a skipped cue is better than a guess.
It covers the American mink and North American river otter, the two common species in the US. Sea otters, weasels, muskrats, and beavers are different animals and are not scored here. If your answers split evenly, the page reports a tie and points you to the cue to check first.
Where these numbers come from
The figures and defaults on this page are based on:
- Animal Diversity Web: Neovison vison (American mink), Mink weight, length, diet, activity, and musk glands. (checked October 2026)
- Animal Diversity Web: Lontra canadensis (river otter), Otter size, webbed feet, diet, and social behavior. (checked October 2026)
- Missouri Department of Conservation: American Mink, Mink white chin, tail shape, and webbing. (checked October 2026)
- Missouri Department of Conservation: North American River Otter, Otter length, weight, whiskers, and fully webbed feet. (checked October 2026)
Field-identification guide. Wild animals should be watched from a distance, and local wildlife agencies can confirm species in your area.
Frequently asked questions
How can you tell a mink from an otter swimming?
Look at size and tail. A swimming otter shows a long, thick body and a broad head, while a mink looks slim and small with a pointed face. Otters also tend to be in groups.
Are minks and otters related?
Yes. Both are members of the weasel family and both live near water. They are separate species with different sizes, tails, and feet.
Do mink and otter eat the same food?
Partly. Otters eat mostly fish, crayfish, and frogs. Mink eat fish and crayfish too but also hunt mice, rabbits, and other land animals.
Which one smells?
Mink. They have musk glands that produce a strong odor, especially in breeding season.
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