Hello, I am pretty new to caring for chickens, so I am not sure what to do! A few of my hens are losing weight noticeably, but showing no other symptoms. They are eating and drinking regularly as far as I can tell, and their eyes seems clear and healthy. They all seem active, running around and talking to me. Could they have worms? Should I go get some over the counter dewormer, or are their other signs of illness that I should be looking for? My buff orpington is almost skinny looking! help, i love them so much I just want them to be healthy! They are about 4 1/2 months old. Thank you for any advice!!!