In Humans
In humans it can be voluntary or involuntary, the latter being due to a small number of disorders. Regurgitation of a person's meals following ingestion is known as rumination syndrome, a rarely diagnosed eating disorder. It may be a symptom of gastroesophageal reflux disease (GERD).
A subset of people, most current or former bulimics, are able to regurgitate without using any external stimulation or drug, by means of muscle control. Practitioners of yoga have also been known to do this. Professional regurgitators perfect the ability to such a degree as being able to exploit it as entertainment.
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Bubbling fly
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bubbling fly (Calliphora vicina)
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Pollenia sp. blowing bubbles (video, 3m 1s)
Read more about this topic: Regurgitation (digestion)
Famous quotes containing the word humans:
“The worst condition of humans is when they lose knowledge and control of themselves.”
—Michel de Montaigne (1533–1592)
“Because humans are not alone in exhibiting such behavior—bees stockpile royal jelly, birds feather their nests, mice shred paper—it’s possible that a pregnant woman who scrubs her house from floor to ceiling [just before her baby is born] is responding to a biological imperative . . . . Of course there are those who believe that . . . the burst of energy that propels a pregnant woman to clean her house is a perfectly natural response to their mother’s impending visit.”
—Mary Arrigo (20th century)