35.5 - 43 cm, and in addition 28 - 38 cm of the central tail feathers. 300 g. Bill yellow to reddish-orange. Body mainly white. Line around the eye and outer flight feathers of wings, black. A diagonal black bar crosses upperwing. Tail white including central feathers. Tail streamers white. Males and females are similar. Juveniles have the bill dark blue-gray, crown strongly spotted blackish, and feathers that cover the wings with a broad black barred.