35.5 - 40.5 cm. Eyes yellow. Bill black, 4 cm long. Body plumage dark brown. Wings darker, short and rounded relatively. Tail blackish, wedge-shaped. Individuals first summer (March-August): Eyebrow and forehead white. Feathers that cover the wings above cinnamon buff. Adult individuals: Eyebrow white. Crown grayish white, pale gray to grayish brown on nape. Feathers that cover the wings above dark brown. Males and females are similar. Immature lacks of clear crown, the feathers that cover the wings above are pale brown.