African greys are the smartest in the parrot world and cna be dead-on mimickers. Knew one in a pet store who could do a smoker’s hack complete with neck jerks. Customers would go up to the staff and inform them “I think your parrot is sick”. If the cash register makes any repetitive noises, the greys will often mick that - or the phone ringing or the bell that’s used for the kitchen timer.
Many of them are frankly bored being in a cage most of the day so they pick up on any sound they think makes you stop and give attention because they think if they learn the noise, you’ll stop whatever you’re doing and come to them! I knew a grey who mimicked a dot matrix printer. They had to sell him.
What birds do you keep?
Yes, then you have to start feeding them toner.
Totally agreed about Greys. They are incredibly smart. I remember watching vids of Alex the Grey who could do all kinds of stuff, and definitely appeared to understand the concept of zero, which is a fairly abstract thing when you think of it. Unfortunately, he passed some years ago.