One of our barred rocks has started doing this thing where she looks like she's either dry heaving or just yawning constantly. She's about 18 weeks or so and has been doing this a couple days. It's been pretty hot here, but we have fans going in the barn (they roam around the barn and outside the barn), lots of water to drink and there is always food in the feeders for them. I don't know if the heat would have anything to do with it, but thought I'd throw that out there. Any ideas?