Why, this is fascinating! So they can piss, shit and lay eggs out of the same hole? And to think all these years I’ve kept chickens, when I could have had trannies!

No they don't, they have an open wound.

A quick search on duckduckgo didn't disappoint: The word cloaca is from the Latin verb cluo, "to cleanse". Therefore the noun means "sewer".

This is offensive to birds, who are arguably far more human than trannies.