Yesterday when one of my silkie room was crowing like normal and after the crow he would make a sound like when you step on a squeaky toy that is half broke. I checked him over no eye or nose discharge . Listened to him breath and there was no congestion sounds. I did pull him from the others. Checked the others he was with and saw or heard nothing. Well this morning I heard the same thing but with a different room(Polish). Checked him out and saw no signs of anything just that funny spud after he grows. What is going o with them ? Is this a sign of something? What should I do or be looking for or treat.