Images Dated 16th March 2006

Megalodon shark and great white

Megalodon shark (Carcharodon megalodon), computer artwork. A great white shark (Carcharodon carcharias) is shown below it at the same scale. This enormous shark lived between around 20 and 1.2 million years ago, and is known from fossils. It was related to the modern great white shark, and is thought to have fed on whales, as this is the only source of food that could have provided it with enough meat. Megalodon was thought to attain lengths exceeding 20 metres, and possibly significantly larger. It is thought that it died out after the seas cooled, allowing warm-blooded whales to escape the sharks for much of the year by swimming to waters too cold for them to survive in

© CHRISTIAN DARKIN/SCIENCE PHOTO LIBRARY

An MH-60S Seahawk helps conduct a vertical replenishment

Atlantic Ocean, March 16, 2006 - An MH-60S Seahawk helps conduct a vertical replenishment, while the guided-missile cruiser USS Leyte Gulf (CG-55) commences her approach prior to conducting a connected replenishment

© Stocktrek Images

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Pacific spookfish

Pacific spookfish (Rhinochimaera pacifica), computer artwork. This is a deep sea chimaera, a relative of the sharks. It uses its long fleshy snout to detect electrical currents, and hence locate its prey. It inhabits the aphotic zone, the region of the oceans where no sunlight penetrates, and is found between depths of around 300 to 1500 metres. It can reach a length of over 120 centimetres

© CHRISTIAN DARKIN/SCIENCE PHOTO LIBRARY