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 (September, 2007)
   http://www.iucnredlist.org
   
2. Ultimate Ungulate (March, 2008)
   http://www.ultimateungulate.com/Artiodactyla/Oryx_leucoryx.html
   
3. The Arabian Oryx Project (March, 2008)
   http://www.oryxoman.com
   
4. CITES (November, 2002)
   http://www.cites.org
   
5. Macdonald, D. (2001) The New Encyclopedia of Mammals. Oxford University Press, Oxford.
   
6. Animal Diversity Web (November, 2002)
   http://animaldiversity.ummz.umich.edu/accounts/oryx/o._leucoryx$narrative.html#geographic_range
   
7. Stanley Price, M.R. (1989) Animal reintroductions: the Arabian oryx in Oman. Cambridge University Press, Cambridge.
   
8. UNEP – WCMC (March, 2008)
   http://www.unep-wcmc.org/species/data/species_sheets/oryx.htm
   
9. Spalton, A. (2005) Pers. Comm.
   
10. Animal Info (November, 2002)
    http://www.animalinfo.org/species/artiperi/oryxleuc.htm
    
11. WWF Arabian oryx: preventing a second extinction (March, 2008)
    http://www.panda.org/about_wwf/where_we_work/asia_pacific/news/index.cfm?uNewsID=1938