Mink

Species

• European mink Mustela lutreola
• American mink Neovison vison
• Sea mink Neovison macrodon (extinct)

Size

The male weighs about 1 kg (2.2 lb) and is about 62 cm (24 in) in length. Farm bred males can reach 3.2 kg (7.1 lb). The female weighs about 600 g (1.32 lb) and reaches a length of about 51 cm (20 in). The sizes above do not include the tail, which can be from 12.8 centimetres (5.0 in) to 22.8 centimetres (9.0 in).

Color

A mink's rich glossy coat in its wild state is brown and looks silky. Farm-bred mink can vary from white to almost black, which is reflected in the British wild mink. Their pelage is deep, rich brown, with or without white spots on the underparts, and consists of a slick, dense underfur overlaid with dark, glossy, almost stiff guard hairs.

Breeding and gestation

Mink show the curious phenomenon of delayed implantation. Although the true gestation period is 39 days, the embryo may stop developing for a variable period, so that as long as 76 days may elapse before the litter arrives. Between 45 and 52 days is normal. There is only one litter per year. They typically have between six and 10 kits per litter. Litters as large as 16 have been recorded at fur farms.

Stereotypy

On farms, minks are placed in battery cages, a type of soft, metal wire cage that restricts their ability to move. This often results in a condition referred to as stereotypies, an abnormal behavior, as a result of the cruelty and neglect humans impose on them. These abnormal, repetitive behaviours are a result of keeping them imprisoned, and is similar to the deterioration of mental health in humans. Stereotypies have also been noted to increase during human presence.

To attempt to eliminate stereotypies in captive mink, the National Farm Animal Care Council has implemented regulations on incorporating environmental enrichments into mink cages. Enrichments are pen-related alterations or the addition of novel objects to improve the mink's physical and psychological health. Enrichments may help reduce the onset of stereotypies, but rarely decrease or eliminate them entirely. Leaving minks alone plays a large role in the prevention of stereotypies in them, and huge a role in the animals' well-being.

Lifespan

The maximum lifespan of a mink is usually around ten years, but rarely exceeds three years in the wild.

Diet

Mink prey on fish and other aquatic life, small mammals, birds, and eggs; adults may eat young mink. Mink raised on farms primarily eat expired cheese, eggs, fish, meat and poultry slaughterhouse byproducts, dog food, and turkey livers, as well as prepared commercial foods. A farm with 3,000 mink may use as much as two tons of food per day. In all, US mink farms use about 200,000 tons of dairy products.

Predators

Great horned owls, bobcats, foxes, coyotes, wolves, and humans are all natural predators of mink. Mink are often hunted to protect the fish population in lakes and rivers, but are becoming endangered because of this. They are trapped for their fur (though the majority of mink fur on the market comes from fur farms.).

Waterside habits

Mink like to live near water and are seldom found far from riverbanks, lakes and marshes. Even when roaming, they tend to follow streams and ditches. Sometimes they leave the water altogether for a few hundred meters, especially when looking for rabbits, one of their favorite foods. In some places, particularly in Scotland and in Iceland, where they have become a problem, they live along the seashore. Sometimes they live in towns, if suitable water is available. Mink may be present at all hours, even when people are nearby.

Territory

Mink are very territorial animals. A male mink will not tolerate another male within his territory, but appears to be less aggressive towards females. Generally, the territories of both male and female animals are separate, but a female's territory may sometimes overlap with that of a male. Very occasionally, it may be totally within a male's.

The territories, which tend to be long and narrow, stretch along river banks, or around the edges of lakes or marshes. Territory sizes vary, but they can be several miles long. Female territories are smaller than those of males.

Each territory has one or two central areas (core areas) where the mink spends most of its time. The core area is usually associated with a good food supply, such as a pool rich in fish, or a good rabbit warren. The mink may stay in its core area, which can be quite small, for several days at a time, but it also makes excursions to the ends of its territory. These excursions seem to be associated with the defense of the territory against intruders. The mink likely checks for any signs of a strange mink and leaves droppings (scat) redolent of its personal scent to reinforce its territorial rights.

Working

Recently, a method ("minkenry") has been developed to use a trained mink (usually together with a dog) to kill pest animals such as rats. From available sources, the mink used seem to be black or nearly black ("mahogany") or white, from fur farms, and not wild-colored.