The snow goose has two color variations (morphs): mostly white (with partly black wings), and a darker coloration called 'blue'. The biting surfaces (tomia) of the snow's bill/beak is slightly darker, and is called a 'grin(ning) patch'.
Sunday, before Mass, i snapped fotos on the lakefront along the old Liberty Blvd (now MLK Jr.). You see this fellow with an extended lower leg. That is 'goose stepping', some soldiers march this way in parades.