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These sharks are also large, powerful predators which can be provoked simply by being in the water at the wrong time and place, but they are normally considered less dangerous to humans than the previous group. On the evening of 16 March 2009, a new addition was made to the list of sharks known to have attacked human beings.
Blacktip sharks showing curiosity towards divers has been reported, but they remain at a safe distance. Under most circumstances, these timid sharks are not regarded as highly dangerous to humans. However, they may become aggressive in the presence of food, and their size and speed invite respect. [3]
Even though hammerhead sharks are a large species, they are generally not a threat to divers. As of 2025, there have only been 18 attacks ever reported, and none were fatal.
Horn sharks are innocuous towards humans. Under normal circumstances, horn sharks are harmless to humans and can readily be approached underwater. [3] However, they can be provoked into biting, and some pugnacious individuals have been known to chase and bite divers after being harassed. [6]
Why do sharks attack humans? According to the Shark Research Institute, there are over 400 plus species of shark around the world, which include great white sharks, tiger sharks and bull sharks.
Worldwide, humans kill about 80 million sharks and rays each year, a study last year said. Most are killed by commercial fishermen for their fins and flesh. The chances of being killed by a shark ...
Sand sharks are not known to attack humans. If a person were to provoke a sand shark, it may retaliate defensively. Sand sharks are generally not aggressive, but harass divers who are spearfishing. In North America, wreck divers regularly visit the World War II shipwrecks to dive with the sharks that make the wrecks their home. [8]
[7] [8] A known parasite of the sand devil is the copepod Eudactylina spinula. [9] Sand devil embryo with external yolk sac. Like other angel sharks, the sand devil is viviparous with the developing embryos sustained by yolk. Mature females have one functional ovary, on the left, and two functional uteruses.