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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.
ADVERTISEMENT. Cloacal prolapse or vent prolapse is a condition where the inner tissues of the cloaca protrude (hang out) from the vent, exposing the intestines, cloaca or uterus.The 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.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.