One of our hens out of 6 who is not the alpha female just started a new behavior. Starting two days ago she would cluck constantly and bulk up her feathers like she is trying to make herself look big. She usually does it when anyone is near her or sometimes even when no one is around. She isn't aggressive at all. I don't know what this new behavior means? We never hurt or act out toward them in any way. Any info is much appreciated, we just got our ladies a few months ago so raising chickens is new to us.