A "No Crow" collar lowers the volume of the crow. We have an EE, OEGB, d'Uccle, bantam delaware and a bantam barred rock with the collars. You can buy them, but they are simple to make. I will try to find the instructions I found on BYC for them. The only materials you need are 2 inch wide industrial strength velcro, and scissors.
They are placed, snuggly, around the roos neck, above the crop. It does not hinder food or water intake, if on correctly, but it does quite the crow. Some more than others.
Some people are against them, but I have not witnessed any issues with ours. Everyone eats, drinks, mates, tidbits, flies and crows. Just the crow is effected.
