THE accompanying photographs of the aggressive display of the Corn-Crake (Crex crex) were obtained by calling a bird up to a mirror. The technique of calling up a Corn-Crake, using bones, has been previously described (i, 2). When the photographs were taken two hides were used. Mr. F. W. Fox was in one, with the mirror immediately in front of it, and the photographs were taken from the other. The ...

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