What is it about yawning?
- Written by Christine Calder, Assistant Clinical Professor of Behavior, College of Veterinary Medicine, Mississippi State University
You know the feeling. It’s impossible to resist. You just need to yawn.
A yawn consists of an extended gaping of the mouth followed by a more rapid closure. In mammals and birds, a long intake of breath and shorter exhale follows the gaping of the mouth, but in other species such...

