Average Annual Death Toll: 475,000
As far as mammals go, humans are the most dangerous adversary—to other humans. The U.S. homicide rate was measured at 4.7 for every 100,000 people in 2012 (one of the country's lowest results in a decade). Worldwide, the United Nations Office on Drugs and Crime estimated there were almost half a million homocides that year. Forget lions, tigers, and bears, your neighbor might be more likely to kill you than all of those animals combined.
© Laurent Hamels/PhotoAlto/Corbis