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?

These majestic sharks gather in their hundreds at huge volcanic seamounts that project out of the seabed. They come here to be cleaned and to find a mate, circling the seamount in a sort of ...

An atoll is an island or coral reef shaped like a ring that encloses ... a divide between males and females had been reported for scalloped hammerhead sharks but not for great hammerheads.

Peter Klimley is a man who has held his breath and dived down 100 feet to hand-tag hammerhead ... can identify the shark quite easily. Whereas if it's just a gray-colored reef shark, there are ...

Researchers looked at observations from divers over the last 50 years and found that scalloped hammerhead sharks (Sphyrna lewini) experienced a 97% decline at the El Bajo seamount and a 100% ...

These include scalloped hammerhead sharks, tiger sharks, whale sharks, and grey reef sharks - it is not immediately clear which species of shark appeared in the footage. Many hotels and resorts on ...

But ongoing efforts to identify shark “hotspots” across the oceans could help improve their chances of survival in future. At particular risk is the scalloped hammerhead shark, whose young ...

Of the 31 species studied, 24 are now threatened with extinction, and three shark species (the oceanic whitetip shark, and the scalloped and great hammerhead ... (as opposed to reef sharks or ...