Black-bellied flycatchers are more aggressive and, therefore, more successful at staking their turf.
Seeing rejection as a common thread in school shootings, psychologists conducted experiments to see if rejection in the lab produced aggression.
Have you ever stopped to wonder why sex and violence so often go hand in hand?
Social insects such as wasps, bees, and ants rely on sight and odor to distinguish a nest mate from an outsider, but can they decipher between individuals?
Recent studies suggest a correlation between progesterone levels and paternal behavior. Learn more on this Moment of Science.
Two studies suggest that those individuals most prone to violent behavior are narcissists. In Greek mythology, we know Narcissus as the man who fell in love with his own reflection in the waters of a spring, and whose excessive self-love killed him.