By attacking the human (Which means that car accidents caused by deer would not qualify as an answer) Not including insects (I already know the mosquito is responsible for the most deaths) and Man (which is the number 2 killer each year). And, by wild, that would also eliminate domestic animals like dogs. I'm thinking some species of snake, aligator, crocodile or Hippo, but cannot find a definate source. Don't just say snake, because, I know that as a group that includes all snakes would probably be the answer.