It's happened twice now when it's raining. There appears to be blood or a red stain on the back of our only rooster's white neck the past two times it's rained (not any other time). I can't imagine the comb color is running - that's just silly. I couldn't see any injury and the "blood" doesn't turn brown though, and by the morning it was gone. It's closer to the color of the comb than to blood. We have no other roosters and he's really quite the gentleman to his ladies. Can't imagine what it could be? Any ideas? Thanks!