How can I be sure if a chicken has gape worm. I noticed them stretching their necks and opening their beaks. They don't seem in any distress. They free range every evening and have been acting fine otherwise. They don't do it constantly but I do notice it every day. I haven't wormed them yet. What should I use that will kill gape worm as well as any others they may have. They are approx 5 months old I believe. Thanks in advance!
