In a roundabout fashion, I received a small mixed flock of 14 chickens, 10 hens and four roosters. Two of the roosters are HUGE, maybe a Black Jersey Giant and one that looks like a Silver Laced Wyandotte. (I'm going by pictures and descriptions...could be completely off on this.) They are the size of small turkeys! AND they crow at all hours of the day and night, 4-5 crows a minute for up to an hour at a time, even in the middle of the night. They are about 18 months old. The other two roosters are possibly Buff Orpingtons and are very mellow. Is there anything I can do, short of the Ultimate Solution, to get these two guys to shut up? If I had close neighbors, I'd be hung by now. I should mention that they are free-range. I tried keeping them in a coop but that didn't work out. They crowed nonstop in there. Help! Please?