Black-footed ferrets were twice declared extinct before small surviving populations were discovered. Captive breeding and reintroduction to prairie dog colonies has restored wild populations, making it one of the most intensive conservation welfare programs in North America.
Black-footed ferrets in captivity require specialised housing that allows normal mustelid behaviour including burrowing, hunting, and social interaction. Genetic management from a tiny founder population creates inbreeding concerns that affect individual immune function and reproductive success. Reintroduced ferrets face acute predation risk and the challenge of learning to hunt live prairie dogs after captive rearing. Welfare monitoring post-release requires intensive trapping and health assessment.