Unusual Redhead at Rio Blanco SWA, Rio Blanco County

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Friday at about 7:30 a.m. and again at 1:15 at Rio Blanco SWA near Meeker I saw an unusual Redhead in a group of 15 other Redheads.  Its head pattern matched the one in Sibley Birds West, second edition, page 24, which he labeled "white-headed variant."  Fortunately that was the field guide I had with me.  Now that I'm home, I've looked online and in other field guides but cannot find another reference to that variant.

Has anyone else seen a Redhead in Colorado like the one in Sibley's book?  Why is it not included in other field guides?  I do not have a photo of the duck and this is one of the few times I've wished I carried a camera.  I will appreciate your thoughts about this strange looking duck.   

Lynne Miller

Colorado Springs