Size: L: 35 cm Wt: 150 g. Males and females are similar. Seasonally dimorphic.
Summer Adult: mantle and wings grey, with gray wing-tips; head white, with black forehead, crown, and nape; underparts white; tail forked, grey, with white outer edges; bill red, with black tip; legs red
Juvenile: mantle and wings grey, with brownish mottling throughout; head white, with blackish, crescent-shaped smudge through eye; underparts white; tail forked, grey with whitish rectrix tips; bill pinkish, with black tip; legs red
Nestling: semiprecocial and downy; upperparts pale grey to cinnamon-buff, and spotted or streaked blackish-brown; underparts paler, becoming whitish on belly; throat brown