Minks occasionally kill more than they can eat. In winter, they cache carcasses and revisit them to feed. Minks den in abandoned woodchuck tunnels, hollow logs, vacant muskrat lodges, and holes in stone piles and beneath large tree roots. Dens are usually near water and may have more than one entrance. Minks are basically solitary, except during mating season, when they use a powerful scent from their anal glands to attract mates.
Males fight over receptive females.
It's not known whether minks pair up after mating, although males are believed to mate with several females. Mating occurs from February to April, with most activity in March. After mating, the fertilized eggs develop slightly, but then 13-50 days may pass before the embryos attach to the female's uterine wall and continue developing. This is called delayed implantation, and it's common among mustelids. Females give birth in early May following a gestation period of 28-30 days after embryo implantation.