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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.
Most birds do not have penises, but achieve internal fertilization via cloacal contact (or "cloaca kiss"). In these birds, males and females contact their cloacas together, typically briefly, and transfer sperm to the female. However, water fowls such as ducks and geese have penises and are able to use them for internal fertilization.
This process is sometimes referred to as a "cloacal kiss". The sperm is then transferred into the female, much like the mating process in birds. [95] Along with birds, the tuatara is one of the few members of Amniota to have lost the ancestral penis. [96]
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]
Whether the interruption is a mischievous four-legged friend, a frisky groomsman or a creepy officiant, these kiss pics from the Awkward The most awkward wedding kiss photos of all time Skip to ...
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Image credits: taylorfrankiepaul The partner exchange arrangement inside Taylor’s Mormon community forbade intercourse between the participants, limiting their involvement to kissing and teasing.