Humans appear to be the only species clearly proven to shed tears specifically because of emotions. Elephants, primates, and dogs show behaviors and biological responses that come closest to human ...

Why is it that a squirrel may calmly take food from a picnic table while a deer runs as if its life depends on it at the snap of a twig? For years, ecologists have asked whether animals always treat ...

Crying is one of the most recognizable human emotional signals. Tears appear when people experience grief, relief, joy, or deep stress. Because this response is so familiar, observers often assume ...