Barred as in Cuckoo Plumage Color Standard

Color of Male
PLUMAGE: Bluish white, each feather barred across with irregular light and dark bars; the light and dark bars to be nearly equal in width and to extend throughout the length of the feathers and into all sections of the plumage; shade and depth of color to register the same throughout.

The bars should continue through the shaft of the feathers and into the underfluff and stop short of pure black or white.  Each feather should end in a narrow dark bar.

Color of Female
PLUMAGE: Overall appearance is of a darker shade than the male.  Each feather is barred across with irregular light and dark bars.  The light bars of the female are about one half the width of the dark bars and to extend throughout the length of the feathers and into all sections of the plumage; shade and depth of color to register the same throughout.

The bars should continue through the shaft of the feathers and into the underfluff and stop short of pure black or white.