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Say the bird does start talking shit about one of them: how do you prove it was the other person to teach the bird and not the person being insulted?
This isn't enforceable.
"If the bird talks bad about either person, it will be handed over to a third party for adoption."
"You're welcome, and that will be $3,000."
--my lawyer, probably
Has to be a really dreadful divorce if you spend tens of hours teaching "Michael is a shitmuncher" to your parrot, just so your ex-partner loses visitation rights to it, and you get to listen to it repeating that phrase for the 30+ years of both your miserable lives.
This is the kind of petty shit bitter divorcees do a lot. At least they aren't setting up stuff to prevent the other from killing the damned bird to spite their ex.
Broken hearts can be horribly spiteful; planning for the future isn't often part of that equation.