I have one customer that is insistent that all his eggs be brown ones. I try to cater to him but it is kinda a groan at times.
I don't simply because it seems rude and I think it would cause undue stress to those watching seeing hearing it happening.
A restraunt in town offered "Roostered...
Mine crow to tell me there are predators around the coop. And uh yeah full disclosure I have a motion detector light on the coop that shines in a window a bit. LOL
I think as best I can discern is that it primarily works to keep moisture off the comb so allows the comb to keep itself warm without the water draining the heat and allowing frost bite.