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Most reference books tell us to look closely at the indentations on the leading edge of the head to identify the Geat Hammerhead. Not necassary !! When you see a Hammerhead with the first dorsal fin (that one on his back !!) which looks so tall that you think a 6 year old child drew him...you are looking at a Great Hammerhead.. and they are huge.

Individuals of this species have been reliably measured at over 6 metres in length. This is longer than the biggest Great White or Tiger shark. The Great Hammerheads we see are more normally 3.5 - 4.0 metres which is already a huge shark.

Unlike the Scalloped Hammerheads, we never see groups of Great Hammers but normally one, occaisionally two together. They are rarely seen shallow, more normally around 20 metres. Also they rarely circle the divers as Scalloped seem to enjoy doing, but rather pass majestically by us.

Their 'Ampoules of Lorenzini' are especially well developed and are found right across the 'hammerhead'. They swim slowly just above the sand, swinging their heads from side to side exactly like a soldier with a mine detector and using a remarkably similar technology. In this way, they locate rays buried in the sand and devour them with apparant total lack of respect for the rays sting.

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