Hi, I just noticed that two of my white leghorns head/neck feathers turned dark purple overnight. We have 8 chickens, and these two are still bearing the brunt of being the two newbies, bottom of the pecking order. Is it just that they are being pecked? Or is this avian flu? They still act normal, not lethargic, eating like normal, skittish as always. I'm new at this so pardon my ignorance. Thanks!