I have two roosters whose combs and waddles have started turning dramatically black, just over the last few days. It's definitely not frostbite, as it's very warm here. It has been very wet though, although their coop is dry, and they free range during the day. Both are about 1 1/2 years old. Both are acting lethargic. My Marans rooster also has a peculiar walk, but I did start to notice that a few weeks ago.