A Goffin considers every thing and every space his. They mind everybody else's business and go everywhere.
That said, I tried to get a size comparison of my G2 and BCC but it was hard to get them in the same plane for reference and I was surprised I got as many seconds to try as I did. They both hate the camera VERY much. In reality Sunny is NEVER on Will's spaces because Will will chase him. Sunny is about 300g and Will about 200g.
My Goffin (33, wild-caught) is the most NON-aggressive bird ever. He can get along fine in physical contact with a HM and budgie. NOT with a male BFA - hours of screaming. He can never be out unsupervised for even seconds or he's into something.
My BCC ( in his 40s, wild-caught) is also not aggressive but doesn't wish to be in physical proximity to any bird. He's allowed out all day as he does mind his own business and keeps to his own space.
Here's the pics I managed. Definitely "I'm not happy Mom" body language from both.
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