blue·bird /-ˌbɝd/
 知更鳥
 Blue·bird n. Zool. A small song bird (Sialia sialis), very common in the United States, and, in the north, one of the earliest to arrive in spring. The male is blue, with the breast reddish. It is related to the European robin.
 Pairy bluebird Zool., a brilliant Indian or East Indian bird of the genus Irena, of several species.
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 bluebird
      n 1: fruit-eating mostly brilliant blue songbird of the East
           Indies [syn: fairy bluebird]
      2: blue North American songbird