American MinkNeogale visonWhere and when to see them

The American mink is a semiaquatic member of the weasel family native to much of North America. It occurs along both the Columbia and Mississippi river systems, where sheltered banks and wetlands provide food and cover. Its streamlined body, dense fur, and swimming ability suit a life spent hunting between land and water. Although globally widespread, mink depend on healthy waterside habitats and can be affected by wetland loss and contaminants that accumulate in their prey. Introduced populations outside North America can threaten native wildlife.

Size

Body length about 30-50 cm (12-20 in), plus a tail of about 13-23 cm (5-9 in); males are generally larger than females.

Weight

Typically 0.5-1.6 kg (1.1-3.5 lb), with males generally heavier than females.

Lifespan

Usually about 3-4 years in the wild; can live around 10 years in captivity.

Status

Least Concern (IUCN).

American mink are mostly solitary, with adults usually coming together only to mate. They are often active at dusk, at night, and around dawn, although daytime activity also occurs. Individuals patrol waterside home ranges and use scent marks to communicate. They swim and dive readily, but also hunt on land and can climb. Dens may be situated in bank cavities, hollow logs, or abandoned burrows made by other animals. Mink remain active throughout winter rather than hibernating. Females raise their young without help from males, usually giving birth in spring. They may store surplus prey for later feeding.

• Its toes are partly webbed, helping it swim.
• Dense underfur helps insulate it in cold water.
• American mink can delay embryo implantation after mating.
• Despite its aquatic habits, it is also an agile climber.

Wildlife opportunities depend on the river reach, water levels and species. River-specific viewing months have not been confirmed; general species seasons are not a local sighting forecast.

American mink inhabit the margins of rivers, streams, lakes, ponds, and marshes. They favor places with abundant prey and nearby cover, such as tangled roots, fallen timber, rocks, and dense vegetation. Along the Columbia, suitable habitat includes tributary mouths, wooded banks, and sheltered backwaters. Along the Mississippi, floodplain wetlands, sloughs, and side channels provide similar opportunities. Mink also use some coastal habitats and can occupy modified waterways where food and shelter remain available.

American mink are carnivores that take prey both in water and on land. Their diet includes fish, crayfish, frogs, small mammals, and birds, with the balance varying by season and location. They also eat eggs and occasionally other small animals. Rather than specializing in one food, they exploit prey that is locally available and accessible.

Common name

American Mink

Scientific name

Neogale vison

Animal group

Mammals

Size

Body length about 30-50 cm (12-20 in), plus a tail of about 13-23 cm (5-9 in); males are generally larger than females.

Weight

Typically 0.5-1.6 kg (1.1-3.5 lb), with males generally heavier than females.

Lifespan

Usually about 3-4 years in the wild; can live around 10 years in captivity.

Status

Least Concern (IUCN).

Identification

Look for a small, long-bodied mammal with short legs, a pointed muzzle, rounded ears, and a well-furred, tapering tail. Wild American mink are usually dark brown, often with a white chin patch and sometimes additional white markings underneath. Compared with a North American river otter, a mink is much smaller and more slender, with a less robust tail. A muskrat has a blunt head and a sparsely haired, laterally flattened tail rather than the mink's furry tail.