Stewie knows how to retrieve finally! It’s not really on cue yet, though. Right now there are specific props he knows he’s supposed to bring to me that only appear when I want him to “give it to me” (that’s the verbal cue, not random use of quotes for emphasis). Because he’s still a bit nippy, I hold my hand next to the cage, but a little lower. He picks up the prop (usually a blue ring), waddles over to me. leans down and places it in my hand. The funny thing is that he now thinks anything sitting on his cage that can be picked up should automatically be given to me… or dropped off the side of the cage where I usually stand.
The current trick we’re working on is for him to put a ring on a peg.