I thought about it, and tried making my own (yeah, fail on my part) but then got thinking that the one I want to keep, crows a LOT.... and so even gurgled sounds might be quite noticeable, because we back a neighborhood walking path....You can also get No-Crow Rooster Collars if you want to keep the roosters. I think Cynthia may have tried one of these collars, so maybe she has some experience she can share.