This is my first year with back yard chickens. Going to be our first winter...all are under a year except my polish hen I adopted last spring..she was a year in Sept 2013...my hens are being fed organic and free range in our yard and have half a garage transformed into a coop...all seemed to be doing well even with this cold weather, none seemed to be doing much of a molt, only a few feathers here and there but eggs are less and that is ok, I'm not heating or lighting the coop...Penelope , my Polish hen, started molting, stopped laying eggs about 2 weeks ago, and the last week had been acting lethargic, not perching at night, not eating etc so I thought it was due to the molt, how er yesterday, she seemed much worse and did not go outside just sat there..when picked up she would give big breathy weese therein quiet for a bit then again...so we thought maybe too cols so brought her inside...this morning we found her dead...I am so sad as I lost one to drowning in pool not long ago..def not a good experience for a first trimmer! Now what could have been wrong? Anyone have ideas? Will my other birds get sick?