cloacal kiss

The method in which a male bird fertilizes the ovum of a female bird. The male and female press their cloacals (a prosterior opening which functions as the end of the reproductive, digestive, and urinary tracts) together for a few moments to transfer sperm to the female.

Mel: Whoa are those birds rubbing their butts together?

Nico: No they're just giving each other a cloacal kiss.

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