?Brown morph Nuttall's woodpecker?

Cynthia Burnham
 

Have a weird bird at my feeder - appears to be a male Nuttall's woodpecker (full red cap), but its back - not face or other parts - is brown-and-white vs back-and-white. I do have a picture, but am having a problem with the flickr link.  Also the picture doesn't really show how brown it is.  
Even my husband - not a birdwatcher - said "That's a weird-looking woodpecker!"

Is this a common thing?

Thanks!
Cindy

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