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One of the commonest species of the genus Boa is the Boa constrictor, which has a wide range from tropical Mexico to Brazil.
The Amazon region is frequented by the giboia (boa constrictor), and the central plateau by the sucurid (Eunectes murinus), both distinguished for their enormous size.
As the stomach empties, these constrictor rings begin further up in the body of the stomach promoting further gastric emptying.