About a week ago, we got a no- crow collar for our sweet roo. Now I've noticed his crop is HUGE, like a balloon! I took the collar off straight away and kinda massaged his crop a little. Heaps of air came out of his mouth. His crop is considerably smaller now. He didn't seem affected at all even with the big balloon crop he was happily eating and making other chicken noises. Is this a common thing that happens with the collars? Does it mean I put it on too tight? He didn't seem bothered by the collar when it was on. I've left it off for today though.