Sterna hirundo
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Deeply forked tail with long streamers, whereas gulls have a square-cut tail
Solid black cap running from the forehead to the nape, with white to pale grey underparts
Coral-red bill with a black tip, and short red legs
Hovers bill-down over the water then plunge-dives for fish; gulls do not plunge, they pick from the surface
Smaller than a pigeon, with slender pointed wings and a light, bouncing swallow-like flight