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What was the SIZE of the Gray Gull-like bird you saw in Delaware?



South Polar Skua Dark: This small, gull-like skua occurs in two color phases. Dark phase adult has a dark brown body with a 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. Feeds on fish, krill and squid. Strong direct flight with shallow wing beats. Sexes are similar.
Sabine's Gull: Small gull with gray back and white nape, rump, and underparts. Hood is solid black and eye-ring is dark red. Bill is black with yellow tip; legs and feet are black. The upperwings are gray with black primaries and white secondaries. Tail is slightly forked when folded.
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.
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.
California Gull: This is a medium-sized gull with a white head and underparts, gray wings and black wing tips. The bill and legs are yellow, and it has a red eyering. It has a strong direct flight with deep wing beats. It feeds on worms, mice, other birds and their eggs, and garbage. The sexes are similar, but the males are usually larger than females, with a larger bill, head and tarsi.
Bridled Tern: Medium pelagic tern. Black crown, nape separated from gray-brown upperparts by whitish collar. Chevron-shaped white forehead patch extends behind eye. Long pointed wings and deeply forked tail. Whitish underparts; underwings have brown trailing edge. Black bill, legs.
Gull-billed Tern: Lightest North American tern. Black cap that extends below eyes, down nape; pale gray upperparts that are darker at the wingtips; short, stout black bill and black legs, feet; long wings with very long outer primaries. Direct flight with graceful, shallow wing beats.
Roseate Tern: White below with slight, variable pinkish cast visible in good light; pale gray above with black cap, nape and deeply forked tail that projects well beyond wingtips at rest. Bill mostly black with some red at base; legs and feet are red-orange. Graceful, direct flight.
Arctic Tern: This is a medium-sized, slim tern with gray upperparts, black cap, a white rump and throat, and pale gray underparts. The tail is deeply forked and white with dark edged outer feathers. The bill is dark red. The legs and feet are red. It has a buoyant, graceful flight with steady wing beats. It feeds on small fish, crustaceans and insects. Both sexes are similar in appearance.
Sandwich Tern: This is the only medium-sized tern with a long slender black bill tipped with yellow. The upperparts are very pale gray, nearly white, and the underparts are white. The black crown has a short black crest, the white tail is deeply forked, and the legs and feet are black. It has a direct flight and hovers before diving for fish. Sexes are similar.
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.
 
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