Tawny nurse shark  (Nebrius ferrugineus)

Demersal: Fish that live on or near the ocean bottom. They are often called benthic fish, groundfish, or bottom fish.
Dorsal fin: The unpaired fin found on the back of the body of fish, or the raised structure on the back of most cetaceans.
Nocturnal: Active at night.
Ovovivipary: Method of reproduction whereby the egg shell is weakly formed and young hatch inside the female; they are nourished by their yolk sac and then ‘born' live.
Pectoral fins: In fish, the pair of fins that are found one on each side of the body just behind the gills. They are generally used for balancing and braking.

1. IUCN Red List (May, 2006)
   http://www.redlist.org
   
2. FishBase (May, 2006)
   http://www.fishbase.org
   
3. Marine Themes: The world's largest marine wildlife image database. (May, 2006)
   http://www.marinethemes.com/nursesharks.html
   
4. The Elasmodiver: shark and ray field guide (May, 2006)
   http://www.elasmodiver.com/tawny%20nurse_shark.htm
   
5. Shark Foundation (May, 2006)
   http://www.shark.ch/Database/Search/species.html?sh_id=1098