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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. [8] For palaeognaths and waterfowl, the males do not use the cloaca for reproduction, but have a phallus. [9] One study [10] has looked into birds that use their cloaca ...
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.
Female birds in most families have only one functional ovary (the left one), connected to an oviduct — although two ovaries are present in the embryonic stage of each female bird. Some species of birds have two functional ovaries, and the kiwis always retain both. [81] [82] Birds do not have male accessory glands. [83] Most male birds have no ...
Male waterfowl have developed another modification; while most male birds have no external genitalia, male waterfowl (Aves: Anatidae) have a phallus (length 1.5–4.0 centimetres [0.59–1.57 in]). Most birds mate with the males balancing on top of the females and touching cloacas in a “cloacal kiss”; this makes forceful insemination very ...
Although most male birds have no penis, [6] ducks have a long corkscrew penis, and the females have a long corkscrew vagina, which spirals in the opposite direction. [7] The males often try to force copulation, but the complex mating geometry allows the females to retain control—most forced copulations do not result in successful ...
A notable example of a bird with a pseudo-penis is the red-billed buffalo weaver, which do not use their pseudo-penis for direct insertion during copulation; however it does play a part in successful mating and stimulation. [15] Similarly to the red-billed buffalo weaver, the cassowary, a ratite, exhibits a pseudo-penis in both males and females.
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All amphibians, birds, reptiles, [22] some fish, and a few mammals (monotremes, tenrecs, golden moles, and marsupial moles) have this orifice, from which they excrete both urine and feces in addition to serving reproductive functions. [23] Excretory systems with analogous purpose in certain invertebrates are also sometimes referred to as cloacae.