This little bastard is the deadliest animal in the world, with an estimated 750,000 human deaths every year. According to this great visualization posted by Bill Gates, mosquitoes kill 163,780 more humans than all the other "dangerous" animals combined, including sharks, snakes, and humans—the second deadliest animal.
In fact, sharks and wolves' kills—so feared by humans—are absolutely ridiculous. Humans come at number 2 with about 475,000 kills. The rest seem pretty harmless compared to our own species and mosquitoes.