My Yogi is a rescue BFA and he is still a bit cage bound. He squawks and screams very loudly. He has a very small vocabulary of 4 words and a few sounds that are possibly the beginnings of new words/phrases. We are now used to the loud noises but we think he was shut away in an unused room in his previous life, hence the very loud screaming. There was one squawk he used to do that would make you jump out of your skin! Luckily for our nerves he doesn't seem to have the urge to do that anymore!
Be careful what you wish for - if you want to keep your nerves intact