Unusual Bird: Brown Hairy Woodpecker

A Hairy Woodpecker at my feeder had distinctive brown coloring over much of its normally-black feathers. I noticed it first when it was on the far side of a log and I could see only its head, which was clearly brown. It flew closer and I was able to get several pictures (unfortunately through a plate glass window). It looked almost as if it had been splashed with some sort of color-remover. There was some black plumage, but the dominant color was brown, including the head markings. I could not tell if it was male or female. It had no red mark but that may also have been converted to brown.