"What not to feed: tomato greens and potatoes. Actually they'd have to be starving to eat the tomato greens anyway. One of the few bugs that chickens won't eat is a tomato horn worm. That may be because it's full of tomato greens, which are toxic for chickens."

Maybe my chickens are stupid, but they LOVE to eat tomato horn worms, and they don't appear to have any toxic effect on them either.