Black-footed ferrets were once declared extinct before a small wild population was found. Their recovery through captive breeding and reintroduction is one of conservation's greatest welfare and science achievements.
Black-footed ferret welfare encompasses both the challenges of captive breeding — maintaining behavioral competence for wild release in animals raised in captivity — and the post-release welfare of animals establishing territories in unfamiliar landscapes. The captive breeding program at the US Fish and Wildlife Service facilities uses natural prey conditioning and minimal human habituation to prepare ferrets for wild survival. Post-release welfare threats include sylvatic plague, coyote predation, and inadequate prairie dog prey. Vaccine delivery through oral baits for plague has been a significant innovation reducing mortality. The recovery of this species from seven individuals demonstrates what intensive welfare-focused conservation can achieve.