What is the deadliest mammal in America? Mountain Lion? Grizzly Bear? Nope, it's Bambi. That's right, in the U.S. deer-auto collisions kill an average of 130 human each year. Who doesn't want to know which insect has killed off half of all the humans ever born on this planet? Or in which city it is that more people get bitten by other humans than by cats and rats combined? Deadly is filled with all sorts of killer trivia.