Offer your chickens kale. They'll go absolutely insane. It's best if you do it without chopping, make them work for it. They get a piece of leaf between their beaks then thrash their heads side-to-side like a frenzied pit, trying to rip off the leaf. They fight over who gets closest to the stalk. If one gets a big piece, she'll take off running across the yard, wings out, squawking, with the others in hot pursuit, trying to rip it from her beak. It's HILARIOUS! I hand-feed mine because I enjoy being close to the leafy massacre, but you can always clip the stalk to the fence if you don't hand-feed, or chop it up. I'm going to try to make a video of it in the next day or two, if they (and the weather) will cooperate... OMG I freakin' LOVE chickens.