ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY
Studying whale shark. Marine biologists studying a whale shark (Rhincodon typus). They are able to record details about the shark easily, since whale sharks rarely travel faster than 5 kilometres per hour. The whale shark is the world's largest fish, reaching an average length of 8 metres. It is harmless to humans, using specially adapted gill arches to filter the water, removing anything edible. Its 1.5 metre diameter mouth can circulate up to 6000 litres of water an hour. It is thought to live to an age of 60-150 years. Photographed in the Gulf of Tadjoura, off the coast of Djibouti, in the Indian Ocean.
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