actually brad there are a lot more than 4 speices of sharks that have attacked humans. the thing is how many speices have had fatal attacks. and this story is amazing i would love to be able to ride a tiger shark call me crazy but i love them and believe in my heart that they are not man eaters they just have no other way of feeling other than to bite. which is why the most common attack is known as the bumb and bite or hit and run. they dont want to eat us because we dont taste good to them. the fatal attacks are most likely rouge sharks that havent eaten for a long period of time and do what they must and take the prey they can. more people a year are killed by deer and pig than by shark attack. and for every one person killed by a shark humans in turn kill about a million shraks. fear is the most dangerous feeling a human can have toward an animal becuase we kill what we fear or dont understand and if sharks are extinct then crudely phrased were all screwed.