Arabian oryx  (Oryx leucoryx)

Gregarious: Tending to form a group with others of the same species by habitually living or moving in flocks or herds rather than alone.
Re-introduction: Putting an animal or plant into an area where the species or sub-species previously lived but from which they are locally extinct - usually referring to projects aiming to re-establish self-perpetuating populations.
Territory: Area occupied and defended by an animal, a pair of animals or a colony.

1. IUCN Red List (August, 2009)
   http://www.iucnredlist.org
   
2. Ultimate Ungulate (August, 2009)
   http://www.ultimateungulate.com/Artiodactyla/Oryx_leucoryx.html
   
3. The Arabian Oryx Project (August, 2009)
   http://www.oryxoman.com
   
4. CITES (August, 2009)
   http://www.cites.org
   
5. Macdonald, D. (2001) The New Encyclopedia of Mammals. Oxford University Press, Oxford.
   
6. Nowak, R.M. (1999) Walkers Mammals of the World. Sixth edition. The Johns Hopkins University Press, Baltimore and London.
   
7. Stanley Price, M.R. (1989) Animal reintroductions: the Arabian oryx in Oman. Cambridge University Press, Cambridge.
   
8. UNEP – WCMC (August, 2009)
   http://www.unep-wcmc.org/species/data/species_sheets/oryx.htm
   
9. Animal Info (August, 2009)
   http://www.animalinfo.org/species/artiperi/oryxleuc.htm