Although I do not allow the parrots on my shoulders, Thomas has become lax about this, especially with Rocky and Stella. He's the one risking facial bites and hearing loss and he knows my stance on this. Yesterday, Rocky had climbed out of his sleeve and onto his shoulder.
Seeing this, Stella had to fly over as well. He removed them immediately after I took this picture. Though they are not parrot-aggressive in general, I would not allow him to take chances that something could happen.