Every dog owner knows how hard it can be to say no to "puppy-dog eyes," but a new study shines light on how canine facial expressions evolved and why humans are able to understand them so well.

New research from Baylor University reveals that coyotes, like domestic dogs, have the ability to produce the famous "puppy dog eyes" expression. The study—"Coyotes can do 'puppy dog eyes' too: ...

Emotions are expressed through facial expressions. Just by closely observing a partner's face, one can prevent minor arguments from escalating into world wars. Anna Zamansky, a professor at the ...

Imagine watching a video of a chimpanzee. The ape pulls its lips back in a wide, playful grin. Without realizing it, the corners of your own mouth twitch upward. You smile back. Scientists call this ...