Hammerhead shark

 
Hammerhead sharks (ham-er-hed-sh-ark) it is thought that the hammerhead's unusual head shape helps this shark sense its prey's position in the water.  Sharks do this by picking up small electrical signals that the victim sends out as it moves.  The hammerhead sharks are a group of sharks in the family Sphyrnidae, so named for the unusual and distinctive structure of their heads, which are flattened and laterally extended into a "hammer" shape called a "cephalofoil".  Most hammerhead  species are placed in the genus Sphyrna; some authorities place the winghead shark in its own genus, Eusphyra.  Many, not necessarily mutually exclusive, functions have been proposed for the cephalofoil, including sensory reception, maneuvering, and prey manipulation.  Hammerheads are found worldwide in warmer waters along coastlines and continental shelves.
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