So, one of our hens (red sexlink) has some clear think liquid coming from it's vent. Yesterday my husband went out and let them out to free range, all went out and were acting just fine. A little while later noticed one was in the coop in the laying box, didn't think anything of it, a while later, i was out there, no chicken in nest box, no new eggs. Fas forward a few hours, chicken back in next box. we picked her up and she had a LONG string of clear mucusy stuff coming from vent. my husband thought she was walking funny, i did not see it. So this morning we let the chickens out again, all seem fine pecking around... a few min later the chicken is back in coop all alone. Did and internal and felt no egg or shells, eating fine, does still have clear mucus coming from vent. Chickens are 1 year old almost.