Hairy Woodpeckers with yellow outer rectrices apparently have not been reported in the literature previously (Jackson et al. 2002, Pyle 1997). Birds with yellow instead of red crowns occur from time to time (Putnam 1998), and exposure to tannins, soot, or pitch can stain the white feathers of the Hairy Woodpecker brown (Jackson et al. 2002). The subjects of our paper, however, with the exception of one individual (back cover), exhibited yellow only on the outer tail feathers. The confinement of yellow to the outer tail feathers and the apparent persistence of this plumage pattern from year to year suggest the aberration results not from staining but from carotenism.