To implement the decision of the Conference of the Parties of CMS to list the ruddy-headed goose (Chloephaga rubidiceps) on Appendix I and II of the Convention as a consequence of its endangered status and the conviction that conservation efforts of this species are dependent on collaboration between the two range States, an Article IV agreement was concluded and entered into effect on 21 November 2006.

Signatories to the Ruddy-headed Goose MoU: The continental population of the ruddy-headed goose is migratory and is in imminent danger of extinction because of the small size of its population, its restricted area of distribution, and the numerous threats which it faces in its breeding grounds in the continental area of the Magallanes Region (Chile), in the north of the Tierra de Fuego (Argentina and Chile) and in the wintering grounds in the South of Buenos Aires province (Argentina).

Conscious of the need to take immediate and concerted measures to prevent the extinction of the continental population of the species, both range States agree to:[2] The MoU became effective on 21 November 2006 and is valid for a duration of three years, renewable automatically for a similar term unless one of the two signatories gives three months’ prior written notice to the other of its decision to terminate it.

[4] Despite a decreasing trend in the density of individuals, the co-organization and participation in workshops and the development of a National Conservation Plan for the species successfully increased cooperation between the MoU's signatories.

Furthermore, the reactivation of a ruddy-headed goose forum, the participation in TV and radio interviews, the printing of brochures and books on the species significantly raised the awareness of the locals of the importance of the RHG in the region.