The Parasitic Jaeger (Stercorarius parasiticus) breeds on Artic tundras, and winters in oceans of Southern Hemisphere. Is found in small groups principally in Pacific coast. Adults are 45 cm (12 inches) in height and 475 g in weight.
In winters, feathers of back edged with dull buffy, and crown and hindneck streaked. Under and upper tail-coverts barred with blackish. In breeding and its pale phase, most of underparts are white, and tinged with yellowish on head and neck. In its dark phase, below is uniform sooty-brown. Eats fishes.