European Mink vs. Common Weasel: Key Differences

The Mustelidae family is a weaselly group. The many creatures that comprise this family—minks and weasels among them—are often called several things depending on geography and season (think weasel and stoat and ermine) and broad similarities (many mustelids with mask-like markings are called polecats, even though there is not a designated taxonomic rank for polecats).

The two extant species of the dark-colored, semiaquatic, carnivorous mink are the American mink (Neogale vison) and the European mink (Mustela lutreola). The latter shares its genus, Mustela, with weasels. For the purposes of this article, we will be comparing the European mink with the common or least weasel (Mustela nivalis). This species is also referred to as the little weasel or simply as the weasel.

Key Differences: European Mink vs. Common Weasel

The first thing to know about the European mink is that it likes the water. You likely won’t see a weasel living in or near water, although it can swim. The European mink even has adaptations to its paws that the common weasel doesn’t. Its feet are webbed.

For its part, the common weasel prefers grassy habitats, such as fields, open woodland, bushy and rocky areas, parks, and gardens. This difference—in where they live and breed—is also reflected in their diets. Both species eat small rodents, but the diet of the European mink includes meals found in or near water, such as frogs, fish, crustaceans, and insects. Common weasels are known for being able to take down prey much larger than itself, like a rabbit, thanks to its 34 teeth and non-retractile claws.

There is, however, a chance that you’ll encounter these animals in the same range. Both the European mink and the common weasel are native to Europe. Minks’ range is greatly reduced from what it once was. Outside of two known populations in France and Spain, the majority live in Eastern Europe.

You may encounter the American mink (Neogale vison), which is native to North America, in Europe as it has been introduced to that continent, as well as South America and Asia. It belongs to a different genus than the European mink does, and there are other mustelid species more closely related to the European mink than the American mink.

For their part, common weasels are also native to North Africa, Asia, and North America.

European Mink vs. Common Weasel: Appearance and Size

While both the mink and weasel have slender, elongated bodies with short limbs, they are quite discernible from one another on appearance alone. European minks tend to be dark brown or blackish-brown. The only white appears on their upper and lower lips and chin. Weasels typically have a white underbelly. Both creatures have dense fur, but it appears, even in photographs, much denser and coarser on the European mink.

European minks, being semiaquatic, also, as mentioned earlier, have webbed feet, a trait not shared with their weasel cousin. Common weasels have very sharp claws, which they use to take down large prey.

In terms of size, the European mink is larger, but not by much. Males are usually longer and heavier, ranging between 14.7 and 16.9 inches in length (not including the tail) and between 1.21 and 1.76 pounds. Their tales are typically about 40% of its body length. Mink tails add an additional 6.0-7.5 inches to their overall length/size.

Common weasels aren’t as long or as heavy as European minks. Males range in length from 5.1 to 10.2 inches, and their tails are usually about one-fourth the length of their bodies. Instead of pounds, the common weasel’s weight is measured in ounces. Males weigh between 1.5 and 2.5 ounces, whereas females can weigh as little as 0.9 ounces and as much as smaller males, about 1.5 ounces.

At a Glance