The "saca de las yeguas" is a living tradition that combines elements of the past with others in the present. It consists of driving the herd of horses that graze in the marshes of the Donana National Park to the town of Almonte in Huelva, where the horses are cleaned up and sold. Although equine livestock is now a marginal production sector, ritualization processes and tourism development have intensified the interest of local people and visitors in this livestock practice. The case study enables advances in the protection-policy analysis of ethnological heritage as well as in the strategies orientated towards the conciliation of tourism development with the continuity of traditions.