I use the colored leg bands. They are available at our local feed store. I use them for a couple of reasons. For one, the kids like to name the chickens, and it saves on any fighting over who's who. Also, my neighbor also has Australorps, and also free ranges them from time to time. It helps me identify which ones are mine. We did have a couple of his hens come over for a free meal from time to time. One actually refused to leave and insisted on roosting with my flock. I kept taking her home, and after a few weeks he just gave her to me. She now proudly wears a leg band. I haven't had any problems with them. My oldest girls have been wearing theirs for almost 3 years, and I've only had to replace a couple.