This is the inverted cloaca. If it were a boy, a small penis would be visible here.
In case you don't know, birds have only one exit, and they perform the "act" by what's called the "cloacal kiss". The female then stores the sperm for around a month in special repositories. Each day during a 30 minute window just after the egg is released and before the albumin starts forming, sperm are released from storage and meet the egg.
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