I just got two girls from a ranch, and I'm afraid to put them in with my other chickens because I'm not sure if they are sick or not. I was reading up on sicknesses and some said to deworm chickens regularly just as a preventative method, and others said only if there are signs that the chickens have worms. I wouldn't know how to check for worms. Would there be little crawling things in the feces? Or are they something I can't see? Any help!?