These characteristics distinguish them from the smaller and darker-billed pileated woodpecker. When perched with the wings folded, birds of both sexes present a large patch of white on the lower back, roughly triangular in shape. The chin of an ivory-billed woodpecker is black. In males, the crest is black along its forward edge, changing abruptly to red on the side and rear. The crest is black in juveniles and females. Ivory-bills have a prominent crest, although in juveniles it is ragged. In adults, the bill is ivory in color, and chalky white in juveniles. The underwing is also white along its forward edge, resulting in a black line running along the middle of the underwing, expanding to more extensive black at the wingtip. It is shiny blue-black with white markings on its neck and back and extensive white on the trailing edge of both the upper- and underwing. The bird is sexually dimorphic, as seen in the picture to the right.
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