We had a 2.5 year old hen who was healthy until she was found dead this morning in the coop. She had no symptoms of disease, even yesterday evening. She had been eating, drinking well, and laying eggs regularly. This morning, when we went to let the hens out of the coop, this specific hen was found dead on the floor of the coop in a pool of liquid, which looks like water (we are postulating it's urine). Underneath the perch she had been sleeping on, there was also a pool of similar liquid. The only thing abnormal we found were these weird pools of liquid as described above. We are very sad that she has passed away and at the same time concerned about what this could be...as we don't want to wake up tomorrow morning and find even more hens dead. She was 1 of our 5 hens. Any input or ideas of what this could be and what we can do?