My 1.5 year old RIR hen is making a gurgling noise. It's been a few weeks, she is showing absolutely no other signs of illness, she is very energetic, laying eggs, etc. She is just making this gurgling noise, it sounded just like my meat chickens on the one brutally hot day they ran out of water for a little bit. Everyone was gurgling. It's not super loud, but I have no idea what it could be? Any ideas??