This stay perhaps got way out of sequence in what should have happened when.
IF you found the bird so unacceptable, the reservation should have stopped immediately. Otherwise it would enter a strange realm of a bird causing 'thousands of dollars' in damages, which supposedly is what happened.
Perhaps start at the beginning. The guest arrived with a parrot and then what happened..?
(I got this strange hard-to-get-out-of-my-mind mental picture now of a parrot the size of a Pterodactyl coming to my place).