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The strange, uneven bill of the skimmer has a purpose: the bird flies low, with the long lower mandible plowing the water, snapping the bill shut when it contacts a fish. Strictly coastal in most areas of North America, Black Skimmers are often seen resting on sandbars and beaches. Unlike most birds, their eyes have vertical pupils, narrowed to slits to cut the glare of water and white sand. Flocks in flight may turn in unison, with synchronized beats of their long wings. The world's three species of skimmers are sometimes placed in their own separate family, although they are clearly related to the terns.

Our smallest tern. Often seen flying low over the water, with quick deep wingbeats and shrill cries. Usually hovers before plunging into water for tiny prey; does more hovering than most terns. Populations are endangered in many areas because of human impacts on nesting areas, especially competition for use of beaches. However, Least Terns in some parts of the east are now nesting successfully on gravel roofs near the coast.

Large, abundant, and widespread, the Herring Gull is among the most familiar members of its family, especially in the northeast. It has been extending its range toward the south along the Atlantic Coast in recent decades. In the west, where there are several similar large gulls, no such range expansion seems to be taking place.

Famous as a long-distance champion: some Arctic Terns may migrate farther than any other birds, going from the high Arctic to the Antarctic. Breeds on coasts and tundra from New England, Washington, and Britain north to the northernmost limits of land, and spends the rest of the year at sea. Its migrations take it to every ocean, and to the vicinity of every continent. In North America, seldom seen from land south of its breeding grounds.

The strident laughing calls of this well-named gull are among the most characteristic sounds around tidewater along the Atlantic and Gulf coasts, especially in summer. It seems to be mostly a warm-weather bird, with the majority departing from Atlantic coastal areas north of Florida in winter. Its nesting colonies are localized but often large, sometimes with thousands of nests.

One of four very similar terns on this continent. The species lives up to its name as a 'common' tern mainly in the northeast; over much of the continent, it is outnumbered by the similar Forster's Tern. Also widespread in the Old World.

Common along tropical and subtropical shores, the Royal Tern is a characteristic sight along the Gulf Coast and southern Atlantic Coast, less numerous in California. Aside from a few interior localities in Florida, it is almost never found inland except after hurricanes.

Often the most common and widespread gull in North America, especially inland, and numbers are probably still increasing. Sociable at all seasons; concentrations at nesting colonies or at winter feeding sites may run into the tens of thousands. The Ring-bill has adapted thoroughly to civilization. Flocks are often seen resting in parking lots, scavenging scraps around fast-food restaurants, or swarming over landfills.