Mink prefer to live in areas with plenty of cover. Their river-bed dens are generally deserted burrows made by other river mammals, but mink will dig their own when necessary.
Mink are active at night and dive into water to snatch their prey. They live alone and will defend their own stretches of riverbank against intruders. A litter of up to five young is born two months after mating inside dry, underground nests lined with fur, feathers and leaves. In autumn the young begin to fend for themselves.