My Australorp rooster has been sneezing consistently for a week. The BO rooster, who is less mature, has sneezed a few times over the past couple of days, which is how it started with the Australorp. The birds don't have any other symptom: good appetite, poo, behavior, respiration, and no discharges, robust combs and wattles. None of the pullets (Marans, EE, BPR, NHR) are sneezing. They're all within a couple weeks of 20 weeks old. When the Australorp rooster started sneezing I took stock of the recent status of the flock: - Australorp had been acting more aggressive for about a week or so - more crowing, challenging me - they had gotten into the compost heap several times, but the pile is pretty clean, not smelly at all, no visible mold - they began ranging the remnants of the vegetable garden (some visible fungi under the mulch) - the rooster's tail feathers have a white streak across them, dating from about the time he started sneezing, I noticed some white tipped feathers on on the necks of two of the pullets around the same time. - all the birds look vibrant, alert, active, glossy feathers, healthy appetites Since the rooster started sneezing, here are further changes: - the Austrlorp is starting to mount the pullets (the pullets aren't laying yet) - the BO rooster is now sneezing just a little, and is molting - our weather has turned chilly and wet - bedding change from dried leaves to deep bedding with straw - feed change from starter to layer ration - change from chick grit to chicken grit I've started putting ACV in the water, and feeding extra protein (mostly yogurt) and some garlic. We're in Southern Oregon - doesn't get all that cold here, so they are in a fresh air coop with 3 sides wind blocked. I haven't quarantined yet, having read that sneezing on it's own isn't much to worry about. But now that the 2nd rooster is sneezing, should I separate them? Should I put the roosters in the greenhouse for extra warmth till they stop sneezing? I don't want to baby them too much, but these are my first birds, I want to be sure I'm doing all I should. It seems that they are at an age that's ripe with transition, akin to our adolescence, I guess. Can the stress of that cause this? If the problem is mold from either the compost heap or the remnants of the melon patch, would they have other symptoms? Should I clear the straw out of the coop to see if that's the culprit? I also noticed today, that the 2 roosters and one hen have redder looking feet than normal. They've been out in the run today, in the rain, would that do it? Am I being a chicken-hypochondriac? Thanks in advance for your help!