Whelping dens are in hollow trees, but may have temporary dens in brush piles, woody debris etc. Considered to be a valuable furbearer. This mink is primarily found in riparian habitats, and preys on crustaceans, craw fish, frogs, rodents, muskrat, and other similar sized animals of opportunity. One of the first well documented studies of predator prey relationships was done on mink and muskrat by Paul Errington. He found that predation on muskrat was highest during high muskrat densities, and negligible at low densities.
Weasels typically prey on rodents and ground nesting or feeding birds.
The short-tailed is considered to have more valuable winter fur. Home ranges are from 5 to 125 acres. Litters of 3-10 born in spring. Mate in summer. The badger preys on rodents and snakes.