The bull sharks are also known as Zambezi sharks, which are very common in the warm waters of all around the world. What makes this shark so different and dangerous to people is that it can swim up shallow, rivers and pond and has the ability to take on fresh waters as well as salt waters. Swimming along the coasts and up the rivers, the bull shark is well known for its unpredictable, often aggressive behavior and attacks on humans. Various other polls have listed bull sharks as having the most number of attacks on humans than any other sharks. Known unprovoked attacks on 82 humans, killing 25 people.