Yes like a purr... he always does it when he gets food or treats and I always say "Your Welcome."
He lets me rub his head and around his eyes and beck but only through the bars of the cage.
He use to lay in the palm of my hand upside down and enjoyed being with people. Outside his cage. Since puberty he stays in his cage. Though he has been known to breakout during feeding and wander on the floor.
It doesn't happen often and he just climbs on my stick and slips back in his cage. I have a very odd parrot.
Love All Life, Thank You For Posting! :)