A trap placed at a good site in an area with little or no mink trapping history may catch ten mink in its first year of operation, five mink in year two and thereafter 0-2 mink annually. Mink are territorial, so they never occur in the densities of rats, and their numbers will be rapidly diminished if traps are kept active year-round. In areas with little mink habitat or a history of trapping, a trap may not catch a single mink in its lifetime, but that trap is still extremely valuable in telling us that mink are few and far between at that site. It’s worth bearing in mind that the aim is to remove mink catches to zero, everywhere.