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Short-tailed Shearwater: Medium shearwater with dark brown body and occasional traces of white in the center of upperwings. Bill is short and dark. Feet are dark gray and trail slightly behind tail in flight. Tail is rounded. Alternates strong flaps with long glides, often soars for long periods.
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South Polar Skua Dark: Small, gull-like skua, occurs in two color phases. Dark phase adult has dark brown body, large white patch at base of primaries visible in flight. Dark bill, thick and heavy; short, broad tail. Light phase adult has pale gray-brown head and underparts. Strong direct flight.
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Parasitic Jaeger Dark Morph: Medium jaeger with brown body, darker cap, and pale underwing patches near tips. Pale form has white underparts with brown breast band; intermediates between dark and light morphs occur. Diamond-shaped tail has elongated, pointed central feathers. Black bill, legs, feet.
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Long-tailed Jaeger: Small jaeger with gray upperparts, white breast, gray belly. Black cap covers eyes, crosses chin and ends at yellow nape. Upperwings are dark-edged. Tail is gray with black edges and long, black streamers. Legs are blue-gray and toes are webbed. Hovers before dipping for prey.
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Bonaparte's Gull: Medium gull with black head and bill, gray back and wings, white underparts and tail. White outer primaries with black trailing edges are visible in flight. Legs are red-orange. Catches fish by wading and diving. Light and direct flight with rapid wing beat, ternlike.
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Ring-billed Gull: Medium gull with gray upperparts and white underparts. Head is white and bill is yellow with black ring near tip. Wings are gray above, tipped black with white spots, and white below. Yellow legs and feet. Strong direct flight on deep wing beats, soars on thermals.
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Mew Gull: Medium-sized gull with gray back and upperwings, and white head, neck, breast, and belly. Bill is bright yellow. Wings have white-spotted black tips; tail is white. Feet and legs are dull yellow. Graceful, bouyant flight. Undulating, with several rapid wingbeats and a pause.
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Herring Gull: Large gull, pale gray back and wings with black tips, white head, neck breast. White tail and underparts. Bill is yellow with red spot near tip; legs are pink. Strong steady flight with deep wing beats. Soars on thermals and updrafts. Most widespread North American Gull.
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Glaucous Gull: Large, white gull with pale gray back. Eyes are yellow. Bill is yellow with red spot on lower mandible. Wings are white-edged and white tipped. Legs and feet are pink. An active predator of seabird nesting colonies. Slow, steady wing beats. Soars on thermals and updrafts.
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Thayer's Gull: Large gull, gray upperparts, white head, tail, underparts. Bill is yellow with red spot near the end of the lower mandible. Wings are gray with white-spotted, dark gray tips. Legs are dark pink. Direct flight, strong, steady wing beats, soars on thermals or updrafts.
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Arctic Tern: Medium, slim tern with gray upperparts, black cap, white rump and throat, and pale gray underparts. Tail is deeply forked and white with dark edges on outer feathers. Bill is dark red, rarely tipped with black. Legs and feet are red. Bouyant graceful flight with steady wing beats.
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