Bull shark
According to the International Shark Attack File (ISAF), Bull sharks are responsible for at least 69 unprovoked attacks on humans around the world, 17 of which have resulted in deaths. However, this species is likely to be responsible for many more attacks, and has been considered by many experts to be the most dangerous shark in the world. Because of its large size, its ability to enter freshwater, and the fact that it is found inshore, it might be more of a threat to humans than either the Great White Shark or the Tiger shark. Since the Bull shark is found in many Third World regions including Central America, Mexico, India, east and west Africa, the Middle East, southeast Asia, and south Pacific islands, attacks are often not reported. The Bull shark is also not as easily identifiable as the Great White or the Tiger shark, so it is likely to be responsible for a large percentage of attacks with unidentified culprits.