TOM MCHUGH / SCIENCE PHOTO LIBRARY TOM MCHUGH / SCIENCE PHOTO LIBRARY
Blue shark. Head of a blue shark (Prionace glauca). This shark is found throughout the world apart from in colder waters. It tends to follow huge shoals of fish such as tuna and mackerel, its main prey. It also feeds on other sharks, squid and mammals such as dolphins. It has been known to attack humans, although it rarely ventures into coastal waters. It is a fast-swimming and powerful shark, and may reach up to four metres in length.
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