One of my Reds was laying apart from other hens and rooster in the coop. I noticed drops on her beak. When i picked her up she opened her beak and spewed a puddle of dark brown liquid. Her chest area seems full of liquid. She is lethargic. What is it? And is it contagious? The weather here has changed dramatically from summer heat to very cold nights already. 6 other hens are molting but seem fine...today. any ideas?