I was never able to get much info on Marty's past so I've no idea, but I'd bet on it. He was never happier than when he was wrapped in a blanket or towel. It was the weirdest thing. I've never had a cockatiel before or since who would burrow under covers entirely unprompted.Really! Were they raised with it?
As for Skyline, certainly not. The only life he knew before I got him was the inside of a carry cage. It took me years to earn his trust, but at this point I can do just about anything with him.