Desertification: a process of sustained decline of the biological productivity of arid and semiarid land; the end-result is desert, or skeletal soil that is irrecoverable.
Territories: areas occupied and defended by an animal, a pair of animals or a colony.
Woodfine, T., Gilbert, T. and Engel, H. (2004) A summary of past and present initiatives for the conservation and reintroduction of addax and scimitar-horned oryx in North Africa.Proceedings of the EAZA 2004 Conference, Kolmarden. EAZA Executive Office, Amsterdam.