The sand tiger shark (Carcharias taurus), grey nurse shark, spotted ragged tooth shark, or blue-nurse sand tiger is a species of shark that inhabits coastal waters worldwide. It lives close to the shorelines and sandy beaches of North America, hence the name sand tiger shark. It also dwells in the waters of Japan, Australia, and South Africa. Despite its fearsome appearance and strong swimming ability, it is a relatively placid and slow-moving shark. This species has a sharp, pointy head, and a bulky body. The sand tiger's length can reach 3.0 to 3.4 meters (9.8 to 11.2 ft). They are grey with reddish-brown spots on their backs. The sand tiger prefers to hunt close to shore, and shivers (groups) have been observed to hunt large schools of fish. Their diet consists of bony fish, crustaceans, squid, and skates. Unlike other sharks, the sand tiger can gulp air from the surface, allowing it to be suspended in the water column with minimal effort. During pregnancy, the most developed embryo will feed upon its siblings, a reproductive strategy known as intrauterine cannibalism. The sand tiger is categorized as vulnerable on the International Union for Conservation of Nature Red List. It is the most widely kept shark in public aquariums owing to its large size and tolerance for captivity.
These sharks were also recently used in a successful experiment in artificial uterus development. (Source: http://www.wired.com/wiredscience/2011/09/artificial-shark-uterus/)
Read more about Sand Tiger Shark: Taxonomy, Description, Behaviour, Interaction With Humans, Habitat and Range, Reproduction, Conservation Status, Common Names
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“When a man wants to murder a tiger he calls it sport; when a tiger wants to murder him he calls it ferocity.”
—George Bernard Shaw (1856–1950)
“I have often told you that I am that little fish who swims about under a shark and, I believe, lives indelicately on its offal. Anyway, that is the way I am. Life moves over me in a vast black shadow and I swallow whatever it drops with relish, having learned in a very hard school that one cannot be both a parasite and enjoy self-nourishment without moving in worlds too fantastic for even my disordered imagination to people with meaning.”
—Zelda Fitzgerald (1900–1948)