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)
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