The northern bald ibis is one of the world's rarest birds, with a tiny wild population in Morocco and reintroduction programmes in Austria, Germany, and Italy using human-led migration to establish new populations.
Northern bald ibis welfare in reintroduction programmes requires careful management of human imprinting during foster rearing. Birds reared by humans wearing ibis costumes develop appropriate species identification without excessive tamer habituation. The unique human-led migration approach requires birds to be comfortable enough with their human foster parents to follow aircraft without stress, while maintaining sufficient wild wariness for survival after independence. The exceptional conservation value of this approach has driven welfare-positive innovation in reintroduction methodology that is applicable to other migratory species.