Shirley my 8mth old hybrid is stretching out her neck and opening her mouth, over and over again, shes been doing it all evening. I worm her with verm-x every 4 weeks. I clean out her coop daily its on slab so i brush up all poop/feed, bag and bin it then clean out with very hot water, I also wash out waterer and feeder daily. I disinfect the whole coop and run with Vikrons (sp?) 4 weekly after they've been wormed. They free range all day. What could this be? Is there anything I should do for her? I try to keep them as happy and clean as possible. Im a bit worried.