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The tern (scientific name : Sterna hirundo ) is named after its tail shape similar to the domestic swallow, and is a smaller group in the gull family. The mouth is slender, with a straight or almost straight peak shape, not curved The feet are short and delicate, and the web between the toes is not deeply concave Long tail, exceeding wing length ½? It is in a deep forked shape. The feathers are generally gray or white, and there are often black stripes on the head.