|Photo: Barry Peters|
|Bonnethead shark - Photo: Valerie Everett|
Another interesting characteristic is the way hammerheads reproduce. Unlike most sharks, hammerheads do not lay eggs. Rather, their young are nourished in a yolk sack inside the female. After the yolk as been depleted, these yolk sack structures, which are more akin to leather than to an egg, are laid by the female and the pups are born. Hammerhead shark litters can range from 12-40 pups each depending on species.
So what is up with the shape of that head anyway? Like all sharks, hammerheads have electroreceptor sensory pores called ampullae of Lorenzine that allow them to detect the electrical fields given off by other animals. It is believed that the hammerhead’s wide head allows these pores to be more spread out, thus allowing the hammerhead to detect prey more easily than other sharks. It is also thought that the wide spacing of the eyes gives hammerheads binocular vision, and it is known that great hammerheads will use their heads to pin prey against the ocean floor.
|Photo: Su Neko|