You can just barely see the edge of black on her comb. Three of my four red pullets have some black at the edge of their comb, which showed up within the last week. It rained for about a week, and frosted overnight once or twice. The chickens are all acting normally. I was initially freaking out, thinking they have some circulation problem, or the avian flu or something. But it has been several days and they still seem fine.
I am fairly certain it is frostbite, but I wanted to get some opinions and see if I am missing anything. Thanks!
