Chicken peck protector.
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Previously:
https://www.homemadetools.net/forum/...7307#post85468
https://www.homemadetools.net/forum/...2966#post77185
https://www.homemadetools.net/forum/...858#post119440
https://www.homemadetools.net/forum/...369#post161817
https://www.homemadetools.net/forum/...552#post151477