Because people are too stupid to notice that it lets in more air in your body when you don't have enough
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Covering your mouth when you yawn is often seen as a social etiquette to prevent the spread of germs. When we yawn, it is possible for saliva and bacteria to be expelled into the air, and covering your mouth can help contain this. It is a considerate gesture to protect others from potential germs.
Do birds yawn?Yes,they do. Actullay,they do,they don't make any sound,they just open there beaks/bills wide.but why is the questionRepetetive yawning in birds (most notably Cockatiels) means they are trying to clear their sinuses. Dust, dander, and little pieces of feather or down can get lodged in the sinus cavities, and a bird will yawn to try and clear the passage.A single yawn however, is just a yawn.KrisBirdiemoversColumbus, OH
yes they yawn quietly
The past participle of "yawn" is "yawned."
The word 'yawn' is both a verb (yawn, yawns, yawning, yawned) and a noun (yawn, yawns). Examples:Verb: I began to yawn in the middle of the lecture.Noun: The comedian's joke met with a big yawn.An adjective is a word that describes a noun, for example: a big yawn.
Yawning is contagious.