We need some help please. We have a 9 month old hen that is exibiting a strange behavior. She is making a caw like sound every few minutes or so. After she makes to sound she looks like she is gasping or yawning. Other behaviors seem normal. We had a hen die not to long ago. She didn't make the sound but she did breath / gasp like this one. The hen that died was clearly sick and had different symptoms, only the breathing similar. Any suggestions?????