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What was the SIZE of the Gray Gull-like bird you saw in NW. Territories?



Ring-billed Gull: This medium-sized gull has gray upperparts and white underparts. It has a white head and yellow bill with a black ring near the tip. The wings are gray above, tipped black with white spots, and white below; yellow legs and feet. It has a strong direct flight on deep wing beats and soars on thermals. The sexes are similar.
Franklin's Gull: This medium-sized gull has a gray back and white underparts. It has a black head, white eye ring, orange bill with a black spot near the tip, and red-orange legs. The wings are short with white spotted black tips. It has a strong direct flight with deep wing beats. It feeds mostly on terrestrial and aquatic insects. The sexes are similar; males are slightly larger.
Black-headed Gull: Small, white gull with partial hood, white crescents above and below eye, and white-gray back. Red bill. Wings with black tips and black bases of primaries. Sexes similar. Non-breeding adult lacks hood, black mark behind eye, and black tip on bill. Juvenile like winter adult but more black on wing and tail with black tip.
Lesser Black-backed Gull: Medium-sized gull with dark gray back and wings. Head, neck and underparts are white. Rump and tail are white. Bill is yellow with red spot near tip. The wings have dark tips with white spots; legs and feet are yellow. Eyes are yellow with red orbital rings.
Thayer's Gull: Having had full species status since 1973, as of 2017, the AOU considers this gull to be a subspecies of the Iceland Gull and has lumped it there. To see this please jump to the Iceland Gull species account. New subspecies range maps for this bird will be available in the next iBird update at which time we will retire the Thayer’s Gull as it’s own species.
Northern Fulmar Light Morph: This large gull-like bird has gray upperparts and white underparts, head, neck, and tail. Dark morph has uniformly dark gray body and paler primaries. It has a short, thick yellow bill with a tube on top. Feeds mainly on fish, squid and zoo plankton. Flight alternates stiff wing beats with periods of gliding and banking. Sexes are similar.
Great Shearwater: Large shearwater, scaled, gray-brown upperparts, white underparts, brown markings on belly. Dark cap contrasts with white face. Tail is dark above with conspicuous white rump band and gray below. Dark, hooked bill. Pink legs, feet. Flies on deep wing beats followed by long glide.
Sooty Shearwater: This large bird has a dark gray-brown body, darkest on the tail and primaries. The under wing coverts are pale. The bill is long and dark, and the legs and feet are black. It eats fish, squid and crustaceans. Its long narrow wings are slightly swept-back. It alternates strong direct flapping with long glides. The sexes are similar.
Slaty-backed Gull: This large gull has a slate-gray back, white head, belly, tail, and upper wings; dark outer primaries separated from mantle by row of white spots. Gray underside of primaries; broad white trailing edge to wings. It has pink legs and feet, yellow eyes with red orbital ring and a yellow bill with red spot near tip. Diet includes fish, crustaceans and insects. Sexes are similar.
Ross's Gull: The pink gull of the high Arctic. Small gull, pale gray upperparts, gray-white nape, white neck with thin black collar, and white, wedge-shaped tail; underparts are variably pink. Black bill is very short; legs, feet are orange-red. Often feeds on mudflats like a wader.
 
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