Great Hammerheads (#1): Bahamas

Although we love to photograph all sharks, our favorite is the great hammerhead (Sphyrna mokarran). Generally, it is a cautious shark and will keep its distance from scuba divers. There are 9 species of hammerhead sharks worldwide but the great hammerhead is the largest. An average adult reaches lengths of about 3.6 to 4.3 meters (12-14 feet) but can reach 6 meters (20 feet) and exceed 550kg (1,200 pounds).

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Great hammerheads are newer sharks on the evolutionary scale and have developed some unusual characteristics. The unique feature of this shark is obviously the head. The “hammer” which is called a cephalofoil is full of electrical sensors. These pores called ampullae of Lorenzini aid in hunting as these sensors pick up electrical signals given off by all living creatures including humans.

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As you view these photographs notice how different the shark can look depending on the angle of the photograph. On a larger shark, the cephalofoil is about a meter (3 feet) in length and the eyes are at the ends which gives it a large range of vision.

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The diet of this shark is diverse. They will feed on a variety of fishes including tarpons, porcupine fish and even other sharks. As well, lobster, squid, and octopus form part of their diet.  However, their favorite food is rays. Stingrays bury themselves in the sand and the great hammerhead uses its cephalofoil with its electrical sensors to detect their location.

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Octopus On The Run

What do you do if you are an octopus out during the day and a diver with a camera spots you? First, you keep still and use camouflage hoping nobody can spot you, but when that fails you need to move. This octopus tried a number of tactics from trying to blend in, making a run for it, to puffing up to what I assume is to make itself look bigger. Here is a picture sequence that lasted less than a minute until it found a hole to retreat into. Safety at last!Octopus-0064octopus7octopus6octopus10octopus2octopus9octopus4octopus8octopus1octopus11octopus12