Hello, I am a new chicken mama to 11 chickens (10 hens, 1 rooster) and noticed today that about half are missing a noticeable amount of feathers on the back near the base of their tail (mostly the 2 Gold Sexlinks, 2 of my 4 Americuanas, and my 1 Americuana rooster - my 2 Australorps and 2 RIRs are not affected at all). The rooster is also missing feathers on his neck. Could this just be molting? I examined the rooster closely and didn't see anything that looks like parasites, however aren't they too young to be molting? Our weather just changed drastically - went from being in the 80s to a high of 60, lost a couple hours of sunlight, and has been super windy all in the last week or so. Any advice would be extremely helpful!