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(noun) The cloaca is the single posterior opening for a bird's digestive, urinary and reproductive tracts and is used to expel feces and lay eggs. The cloaca is found on the rear of the body under the base of the tail, covered by feathers on the extreme lower abdomen.
It also occurs in birds that have a habit of holding in the stool for long periods of time, like overnight, instead of dropping it as it is comes to cloaca. Any combination of the above reasons can lead to straining, dilating and stretching of the vent, making the bird an ideal candidate for cloacal prolapse. 1  1.he cloaca is the part of the birdâs body which stores urates, feces, urine and egg. The cloacal lips (or vent) are used to control the passage and frequency of droppings and other eliminations.