In animal anatomy, a cloaca kloh-AY-kə is the posterior orifice that serves as the only opening for the digestive, reproductive, and urinary tracts of many vertebrate animals.

What is the cloaca in humans?

A cloaca is a common chamber into which some or all of the digestive, urinary, and reproductive tracts discharge their contents. A cloaca exists in all human embryos up to 4–6 weeks, at which time it becomes partitioned into the urogenital sinus and the rectum.

What is the purpose of the cloaca?

(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.