Question #1: Can all intestinal worms be seen by the naked eye? Question #2: If one chicken has worms is it safe to say the entire flock has them too? The reason I ask is because my 1 year old black australorp has had a pale comb and face for almost a week now. She acts fine, has been eating well, laying well and I have not seen any worms in any of the chicken droppings. I looked around her neck and back for lice or mites but did not see any. All the other hens' combs look fine. Is it possible she could have a parasite that doesn't show up in poop? Any advice would be greatly appreciated.