There are a number of birds at the Panama City Zoo that sit on limbs near feeders.
I don't know if their wings are clipped, but they are not caged nor tethered and seem to enjoy the attention from visitors.
Awwww, I love the Grey. I used to have one. His first word was.....peanut. But they only bond to one person, which was me. He kept biting my husband. So, I left him with a great home with people who had other parrots, including a Grey. They are highly intelligent! I do miss him though