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So every time they would peck it, they would immediately get their treat. But instead of using the clicker for this one, I just let them associate the sound of the bell with pecking it. 
She has only had two training sessions, and she already will jump to my arm from about two feet away, with just the command and not the treat as a motivation. I hide the treat, then command her to jump to my arm, and reveal the food! 
She's doing that pretty well, too!