Why Do Hammerhead Sharks Have Such Strange Shaped Heads?

It is one of the most distinctive looking of sharks and the Hammerhead shark family is made up of nine species. Two of those species, the scalloped and great hammerhead, are listed on the World Conservation Union's (IUCN) 2008 Red List as endangered, while the smalleyed and smooth hammerhead are listed as vulnerable. 

Hammerhead sharks can be found found worldwide in warmer waters along coastlines and continental shelves and feed on a wide range of prey from squid, fish, octopus through to sting rays.