HAMMERHEAD
(Sphyrna spp.)
The Hammerhead Shark is unmistakeably identified by it's head and there are at least nine different species of this shark. The "Great Hammerhead" being one of them. It can grow to a length of approximately 19 feet and are found in every warm temperate and tropical sea throughout the world. There are no known facts as to why the Hammerhead's T-shaped head evolved. One hypothesis is that it's shape is more hydrodynamical which is to say that because of the shape of it's head, the shark's ability to swim through the water is more efficient. The fact that their eyes and nasal passages are so far apart indicates that they have extreme stereoscopic vision and sense of smell. It would also suggest that they have a better field of range in which to use their electroreceptors; used in locating unseen prey hidden in the sand. Prey of this sort would include stingrays that have a sharp spine with which they deliver a potent poison. The Hammerhead appears to be unaffected by this poison and the stingray remains as one it's favorite meals. It has been documented that Hammerheads actually use their head as a weapon to batter and immobilize rays before devouring them.
Hammerheads are mysterious in the
sense that they migrate in large schools. The reasons why large numbers of
Hammerhead
gather together are not completely known although there are several theories
regarding this. Despite the fact that sharks abandon their young at birth,
one theory is that periodic assemblies are used to protect the smaller
Hammerheads from aggression of the larger ones. It should be noted however,
that these sharks do not show any aggression to human on-lookers during
their migration. A bit of our own philosphy--perhaps we could learn much
more from these so called "man-eaters" we call sharks. There
is still so little known about them that we might gain from studying their
habitats before killing them off and regarding them as senseless "eating
machines". Please continue to read on through our web site as we bring
forth more information to enlighten you. We hope that you have already
begun to understand the existence of these predators and that they are
not out to devour all that enter their domain.
BACK TO: SPECIES