A bird's cloaca is usually covered with feathers and not able to be seen during casual observation. In birds, urine and feces from the digestive tube, and sperm and eggs from the reproductive organs, all pass out of the body through a common passage, the cloaca. In birds and reptiles, for example, the cloaca is where urine and feces are discharged and the receptacle for sex and egg laying.Every animal, fish, and insect has a cloaca. Cloacal prolapse is a serious condition that can lead to other complications. Instead, both male and female birds have a cloaca. This means the same opening that excretes feces and urine is the opening from which eggs are laid. There are times, however, when the cloaca can be used to tell the difference between male and female birds. However, a few human congenital disorders result in persons being born with a cloaca, including persistent cloaca and sirenomelia (mermaid syndrome). For some birds, such as ostriches, cassowaries, kiwi, geese, and some species of swans and ducks, the males do not use the cloaca for reproduction, but have a phallus. During that brief touch, an act that is often called a "cloacal kiss," the sperm is transferred from the male's cloaca to the female's cloaca. Even in those that have one, the cloaca is partially subdivided into separate regions for the anus and urethra. The colon, ureters and deferent ducts/left oviduct enter at various levels. (zoology) the cavity (in birds, reptiles, amphibians, most fish, and monotremes but not mammals) at the end of the digestive tract into which the intestinal, genital, and urinary tracts open. Depending on the bird, these wastes may be stored in different chambers of the cloaca, generally with solid material stored in the innermost chamber as nutrient absorption continues. The cloaca and the area of the body where it is located, as well as the physical slit opening itself, is also frequently called the vent. [16][17] Some species have modified cloacae for increased gas exchange (see Reptile respiration and Reptile reproduction). Birds that mate using this method touch their cloacae together, in some species for only a few seconds, sufficient time for sperm to be transferred from the male to the female. However, when the cloaca is exposed, it quickly dries out and gets infected as organs shouldn’t be exposed to air at any time. This is one opening (also called the vent) that serves as the bodily exit for their digestive, urinary, and reproductive systems. In rare instances, injury or infection may cause the cloaca to swell and be more visible. In animal anatomy, a cloaca /kloʊˈeɪkə/ kloh-AY-kə (plural cloacae /kloʊˈeɪsi/ kloh-AY-see or /kloʊˈeɪki/ kloh-AY-kee) is the posterior orifice that serves as the only opening for the digestive, reproductive, and urinary tracts (if present) of many vertebrate animals. It is the continuation of the colon where faeces are stored. The cloaca in birds is the common chamber and outlet where the urinary, intestinal and genital tracts open. [13][14], Most adult placental mammals have no remaining trace of the cloaca. Many birds tend to be hypothermic and will need immediate warming. In addition to birds, amphibians, reptiles, sharks, and rays have a cloaca, the same type of common opening for the digestive, excretory, and reproductive systems. The cloaca is a structure in the development of the urinary and reproductive organs. Subspecies E. c. subsp. ), Revised Edition, 1928, p.103, Bird anatomy § Reproductive and urogenital systems, development of the urinary and reproductive organs, Chemical cues, hibernation and reproduction in female short-beaked echidnas, "Cloacal evaporation: an important and previously undescribed mechanism for avian thermoregulation", "Morphological evidence supports Dryolestoid affinities for the living Australian marsupial mole Notoryctes". The cloaca is the part of a bird's body through which liquid and solid waste is eliminated. It is bounded by the co… Cloaca Definition. Liquid and solid waste is mixed together and expelled simultaneously after a bird's digestion is complete. Some female birds may store sperm for several days or weeks before eggs are fertilized. In birds you can find only one posterior opening that serves for different purposes. 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