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Cloaca
In animal anatomy, a cloaca is the posterior orifice that serves as the only opening for the intestinal, reproductive, and urinary tracts of certain animals, opening at the vent. All amphibians, birds, reptiles, and a few mammals (monotremes, tenrecs, golden moles, and marsupial moles) have this orifice, from which they excrete both urine and feces; this is in contrast to most placental mammals, which have two or three separate orifices for evacuation. Excretory systems with analogous purpose in certain invertebrates are also sometimes referred to as "cloacae".
The cloacal region is also often associated with a secretory organ, the cloacal gland, which has been implicated in the scent-marking behavior of some reptiles, amphibians, and monotremes.
==Etymology==
The word comes from Latin, and means sewer derived from ''cluō'', which meant "cleanse".
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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