I also use the zip ties I have 3 white muscovies and I can't tell them apart except for the color of their ties.

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I don't think it would work they probably have them scratched off in less than 5 mins after being put on, but I see where they are using some kind of collar now to keep roos from crowing so loud. So they don't annoy the neighbors. Who don't like to hear country sounds even though they moved to the country.Can you use a collar on each of your chicken to tell them apart ?