The method in which a male bird fertilizes the ovum of a femalebird. 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.
The combined intestinal, urinary, and reproductive organ of birds, amphibians, reptiles, marsupials, and monotremes. In other words, it's an anus, genitalia, and urethra all in one.
Just consider that for a moment. "Combined intestinal, urinary, and reproductive organ"...let that sink in...........Ewwwwwww.....
I was horrified to discover the lurid details of avian reproduction--which involves a disgusting organ called the cloaca.