Which characteristic on the body provided a dramatic visual contrast against the glossy black plumage?

Answer

Large, conspicuous white patches on the wings

The glossy black body plumage was dramatically contrasted by large, conspicuous white patches on the wings, which observers sometimes described as a white mantle or saddle.

Which characteristic on the body provided a dramatic visual contrast against the glossy black plumage?
speciesbirdcharacteristicwoodpecker