Have a chick about a week and half old that is apparently clicking while breathing. She's acting totally fine, I wouldn't have even noticed the clicking if I hadn't happened to pick her up today. She's not breathing with her mouth open or anything, eating and drinking fine, active and "flying" in bursts around the brooder. The only thing different I've done is today I put a small clump of sod in there for them to play with. Every time I've checked on them today she been completely fine, just the weird clicking. No one else I checked in the brooder seems to be doing it. Any idea what's going on or what I should do?