Some sharks like the Great White or the Gray Reef shark turn aggressive prior to an attack. They arch their back and throw back their head. This places their mouth in a better position for taking a big bite. They also move their tail more acutely, probably in preparation for a chase.
Sharks normally do not attack people. But when provoked they are known to attack ferociously. The Bull shark is the most frequent attacker of people as it swims in very shallow waters where people swim. Some other sharks known to have attacked people include the gray shark, blue shark, hammerhead shark, nurse shark, lemon shark, blacktip reef shark, wobbegongs, sandtiger, spitting sharks, and the porbeagle.
Sharks often mistake people swimming on surf boards for seals and sea lions, some of their favourite foods. The fear of sharks has a lot to do with urban legends around these ferocious looking fishes. Often sea disasters initiate shark attacks that prey on victims adding to the fatalities. You can experience real shark attacks on shark attack videos.
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