By being in the dominant position the females make themselves more attractive to the males. At night, the shoals disperse while the individual sharks hunt for food, with males and females pairing off for mating. When mating, the male wraps his body about the female and holds on with his teeth. Many of the large females in the shoal had very obvious scars on their sides as a consequence. As the day breaks, the sharks return to re-form the shoal and the whole dance is repeated.
Hammerheads are one of the most highly evolved types of shark.
The wide separation of the eyes gives superior vision. The front of the head between a sharks eyes is spanned by sense organs which detect changes in pressure and electrical field. In the case of hammerhead sharks, the width of the head makes these senses more acute than those of other sharks. The head also acts as a wing, improving manoeuvrability. Another attribute of higher evolution is that young hammerhead sharks are nurtured through a placenta inside the mother before birth.