I need some help! I've had chickens for two and 1/2 years and have never seen anything like this. Some of my hens have darkening combs and are showing weight loss. One is severely underweight. Last night she was walking backwards and today my rooster almost fell over. I know these are signs of wry neck. Is it contagious? And could the problem be worms? I've never treated for worms but they are also molting! I can't figure this out!! Need help today!!!