I try to take greens for Bruce's Rhode Island Reds when I walk over. Carl likes greens too. You can see the challenge.
Bruce is training Carl to sit quietly outside the coop while I'm in there feeding kale stems to eight happy, talkative hens...and not to Carl. If he's patient, and he's learning to be, I poke a reward stem through the grid for him.
More posts on Bruce's coop construction and configuration here.