What Is the Cause of Yawning?
Yawning is an action common to all human cultures and among many animal species, from cats and dogs to tigers and chimps. It’s a well-known phenomenon that yawns are contagious–meaning if you see someone else yawn or even just read about yawning, it can cause you to yawn. Here, you’ll learn about the various causes of yawning and what theories scientists have about why we yawn.
