For starters, the great hammerhead shark has a hammer-shaped head, like its name implies, as well as triangular teeth with serrated edges, and concave rear margins on the pelvic fins. The great ...

There are at least eight different species of hammerhead shark, and while fossil teeth evidence suggests that their ancestors may have existed 45 million years ago, molecular data points to a much ...

So seeing a hammerhead shark (Sphyrna tiburo ... and these babies are self-sufficient with teeth and jaws, ready to survive on their own. Access to a hammerhead embryo is very rare, which is ...

That is why shark teeth are the most abundant vertebrate fossil material on the Earth and in the sea. Scalloped hammerhead on the reef. NOVA: Do sharks have to keep swimming to breathe?