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Actually, Polish started with a genetic mutation that created a vaulted skull. The problem with “crowless” roosters is you need genetic material to start with, as you can’t pull it out of nothing. This is very interesting. I did not know this about the ear. I think I remember something about...

I think no one has tried it because anyone who can breed chickens typically don’t need to worry about it. Chickens are very plastic and the crow has been altered before. I wonder if removing it altogether would be possible, and if so, whether it would be effective upon the fertility of the...