I have two chickens that are 3-4 months olds yesterday they both started to lay around and didn't want to stand up for to long. Both are eating and drinking well. They are both. Just lethargic and seem to be squeaking a lot. I have a video but don't know how to post it. They both sit down and have their tales upward and you can see there vent moving up and down. Both have clean vents . Anyone have any thoughts.