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Cloaca of a red-tailed hawk. A cloaca (/ k l oʊ ˈ eɪ k ə / ⓘ kloh-AY-kə), pl.: cloacae (/ k l oʊ ˈ eɪ s i / kloh-AY-see or / k l oʊ ˈ eɪ k i / kloh-AY-kee), or vent, is the rear orifice that serves as the only opening for the digestive (), reproductive, and urinary tracts (if present) of many vertebrate animals.
[citation needed] Internal fertilization with many vertebrates (such as all reptiles, some fish, and most birds) occurs via cloacal copulation, known as cloacal kiss (see also hemipenis), while most mammals copulate vaginally, and many basal vertebrates reproduce sexually with external fertilization. [3] [4]
Cloacal kiss, which consists in that the two animals touch their cloacae together in order to transfer the sperm of the male to the female. It is used in most birds and in the tuatara, that do not have an intromittent organ. [6] Via spermatophore, a sperm-containing cap placed by the male in the female's cloaca. Usually, the sperm is stored in ...
cloaca A multi-purpose opening terminating at the vent at the posterior of a bird: birds expel waste from it; most birds mate by joining cloaca (a " cloacal kiss "); and females lay eggs from it. Birds do not have a urinary bladder or external urethral opening and (with exception of the ostrich ) uric acid is excreted from the cloaca, along ...
Alternatively, for the vast majority of birds—a group comprising nearly 10,000 species [28] —sperm transfer occurs by cloacal contact between the male and female, in a maneuver known as the "cloacal kiss". [27] Birds are one of the only groups which reproduce through internal fertilization but have repeatedly lost the intromittent organ. [29]
Take it on if want to learn what a cloacal kiss is and the related answer to the age old question: "do birds have penises?"; that pigeons blink but most other birds don't; that a bird's rump can be called a pope's nose and lots of other information you will be able to use every day in casual conversation and to lord over your bird-ignorant ...
Female also use cloaca for elimination of digestive waste and for reproduction. For female lizards, the cloaca is the external genital opening for the genital canal, equivalent to vagina in mammals. Copulation is performed through cloacal kiss, in which the male and female press their cloacas together as the male discharges sperm.
Most birds mate with the males balancing on top of the females and touching cloacas in a “cloacal kiss”; this makes forceful insemination very difficult. The phallus that male waterfowl have evolved everts out of their bodies (in a clockwise coil) and aids in inseminating females without their cooperation. [19]