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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.
â¢ Anus and cloaca perform the same function of excretion of waste. â¢ Anus as an opening at the end of the digestive tract is found in mammals whereas cloaca is an opening used for excretion of feces as well as urine in reptiles, birds and fish. â¢ Cloaca is also used for mating and laying of eggs by some species.