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Merely thinking about or seeing someone yawning can make you yawn. But why?
Reasons we we yawn. It was once believed that the main function of yawning was to increase otherwise low oxygen levels, but a 1987 study disproved that theory. And despite extensive additional ...
Snakes yawn, both to realign their jaws after a meal and for respiratory reasons, as their trachea can be seen to expand when they do this. Dogs, and occasionally cats, often yawn after seeing people yawn [11] [65] and when they feel uncertain. [66] Dogs demonstrate contagious yawning when exposed to human yawning.
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Which animals yawn, and has it evolved independently more than once? A little further explanation as to how yawning is advantageous - how would an organism that didn't yawn/respond to yawns be more likely to die? Physiologically, what is the difference (if there is any) between a true reflexive yawn and a voluntary effort to simulate a yawn?
Why do we yawn ? i know that it is surly not for taking much air. —Preceding unsigned comment added by Myownid420 ( talk • contribs ) 04:15, 30 January 2010 (UTC) [ reply ] One possible reason for itching is parasites , though perhaps you meant scratching?
Wondering why you always yawn when other people do? Catch your dog yawning at the same time? Find out why the tired reflex is so contagious.
Merely thinking about or seeing someone yawn can make you yawn (you’re probably yawning right now). Most people yawn because they’re tired, but it can also happen unexpectedly and without any ...