Their upperparts are dark brownish - grey with an unclear pattern of squares on the shoulders , and the underparts , lower face , chin , and throat are whitish .
Non-breeding adults are brownish with a dark neck and head marked with dark grey - brown .
adults ' upperparts are dark brownish - grey with an unclear pattern of squares on the shoulders , and the underparts , lower face , chin , and throat are whitish .
Non-breeding adults are brownish with a dark neck and head marked with dark grey - brown .