As is true of other members of the family, the pileated woodpecker may in autumn be found digging for itself a cavity for winter occupancy.
Few birds other than the woodpeckers make what may be called habitations, except as part of or incident to the activities of reproduction. And in the case of the woodpeckers, while in particular instances these winter retreats are not so used, I am unable to say that they never are subsequently used as nesting cavities.
Life Histories of North American Woodpeckers
Arthur Cleveland Bent