/tags/yawning yawning en-US SA¹ú¼Ê´«Ä± Mon, 15 May 2017 08:37:00 GMT /2017-05-15/yawning-may-promote-social-bonding-even-between-dogs-and-humans Bears do it, bats do it. So do dogs and humans. They all yawn. It's a common behavior, but why is a bit of a mystery. Researchers think yawning may perk up the brain and help with social bonding. Mon, 15 May 2017 08:37:00 GMT /2017-05-15/yawning-may-promote-social-bonding-even-between-dogs-and-humans Michelle Trudeau, Jane Greenhalgh