FRED MCCONNAUGHEY / SCIENCE PHOTO LIBRARY FRED MCCONNAUGHEY / SCIENCE PHOTO LIBRARY
Blue sharks. Group of blue sharks (Prionace glauca) circling a hunk of bait used to attract them. Blue sharks are found throughout the world apart from in colder waters. They tend to follow huge shoals of fish such as tuna and mackerel, their main prey. They also feed on other sharks, squid and mammals such as dolphins. They have been known to attack humans, although they rarely venture into coastal waters. They are sleek, fast- swimming and powerful sharks, and may reach up to four metres in length. Photographed off San Diego, California, USA.
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