sentences:  The MoU has to improve the conservation status of the "South Andean Huemul" by close cooperation between the two range States, since the species migrate across the border region of these countries.The MoU covers two range States (the Argentine Republic and the Republic of Chile), both of which have signed.To implement the decision of the Fifth Conference of the Parties of CMS to list the South Andean Huemul "(Hippocamelus bisulcus)" on Appendix I of the Convention due to its worrying conservation status, an Article IV agreement was concluded between the two range States, the Argentine Republic and the Republic of Chile, and entered into effect immediately on 4 December 2010.