a chamber in the lower part of the gut into which the ducts from the kidney and reproductive organs empty and having one external opening, the cloacal aperture, instead of separate anal (vent) and urinogenital openings
in amphibians, reptiles and birds, the anal opening that serves for both excreting and reproduction. Beavers also have a cloaca rather than the mammalian arrangement of a separate anus and reproductive opening.
The final enlargement of the digestive tract in birds, reptiles, amphibians, and many fish, through which solid wastes, urine, and the products of the reproductive system all pass prior to defecation, egg laying, or copulation. It opens just below the tail of birds and is also known as the vent. In humans, of course, the digestive passage is completely separate from the urinary and genital passages. When copulating, male Purple Martins merely contact the female's cloaca with theirs for as short a duration as a fraction of a second, which is long enough to successfully transfer their sperm to the female's reproductive tract.
Cloaca is a 2003 Dutch film, directed by Willem van de Sande Bakhuyzen. It is a film adaption of the 2002 theatre play Cloaca written by Maria Goos, who wrote the scenario for the film as well. The leading roles celebrate men in their 40's who were formerly student friends but since then have let their relationship go stale.