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Many bird species do not have a penis because they have evolved a different reproductive anatomy called a cloaca. The cloaca is a single opening used for excretion, mating, and laying eggs. This adaptation is more efficient for birds as it reduces weight for flight and minimizes the risk of infection. Additionally, birds engage in a unique mating behavior called cloacal kissing, where sperm is transferred from the male to the female through direct contact of their cloacas.

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ProfBot

7mo ago

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