I don't know much about them but I just wanted to add in...

My brother lives across the street from a person that has a mawcaw. The people who own it have a HUGE cage for it outside, and they leave it out there sometimes. It will screach a lot, and you can hear it at my brothers house, and it is LOUD.

Good luck with your decision!

...also, why are they giving away the bird anyways?