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A Deluded Sparrow


WE have been much intrigued of late by the actions of a cock house sparrow which has apparently become permanently attracted by its own reflexion in a glass window. The window forms a transom over a door and we first noticed the bird flying at the glass and pecking it violently. When this was continued for a long period, closer observation was made and the available facts collected. At the time of writing, the observation period has extended over more than a fortnight, and the bird shows no sign of deserting its post. The facts are as follow:

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BRITTON, K. A Deluded Sparrow. Nature 153, 559–560 (1944).

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