Mine free range for about half the day. I had to fence off the cabbage in my garden; talk about chicken treats! They ate an entire row of kale, but didn't seen to care for the squash (until the squash bugs attacked), lettuce, salad burnet or the okra. Didn't bother any of my herbs (parsley, oregano, catnip, hyssop, or chives). They did eat all the figs off of a small fig tree with low branches, but who wouldn't?
And to top it off, we have a golden lab who LOVES carrots (will dig them out of the ground), tomatoes, corn and beans. Next year I may plant a garden just for the critters. We live in the middle of a forest; haven't been bothered by deer, squirrel or rabbits. Many there was just nothing left for them!