Black-footed ferrets were declared extinct in 1979 before a wild population was discovered in 1981, leading to a captive breeding program that has reintroduced thousands of animals.
Black-footed ferrets in captive breeding programs face the welfare challenge of maintaining wild behaviour while in human care. Ferrets bred in captivity require pre-release conditioning in large naturalistic enclosures to develop prairie dog hunting skills. Post-release mortality is elevated as animals establish territories and adapt to wild conditions. Plague outbreaks in prairie dog colonies eliminate the food and shelter resources ferrets depend on, causing starvation. Individual animals surviving plague events face nutritional stress in depleted prairie dog towns.