When I went out to the coop this morning, one of the hens was on the roost and I saw a long stringy strand hanging from her rear end. It didn't look like roundworms I've seen on dogs but more like residual diarrhea. Her dropping have been pretty normal, with some occasional diarrhea. Everything else is pretty much as usual. She hasn't been laying for a week or so but the weather has recently changed (I'm in upstate New York). Does anyone have any idea what this could be? What should I do? Thanks!