Sand tiger, grey nurse shark, ragged-tooth shark
Their fearsome-looking teeth are an adaptation to gripping fish and other slippery prey.
Males average 2.4m and females average 2.6m. The largest recorded was 3.2m.
Sand tigers are fairly large, stocky sharks, with blunt snouts and large, unserrated teeth. Their skin ranges from a sandy-brown to grey-brown colour and they have dark spots, which fade as they mature.
Sand tigers inhabit the Atlantic, Pacific and Indian Ocean and the Mediterranean sea, although they are rare here.
They live at all water levels as well as the surf zone and reefs.
Sand tigers are sometimes found in groups and have been known to herd prey. They feed on bony fish, rays, other sharks, crustaceans, squid and octopus.
Sand tigers are slow but strong swimmers, and are active at night. They gulp air at the water surface, which they hold in their stomach to achieve buoyancy.
During reproduction, several embryos develop in the mother at different rates. The largest embryo eats the other embryos and eggs so that only one embryo per uterus survives (sand tigers have two uteri).
Sand tiger sharks are listed as Vulnerable by the IUCN Red List.