Observations on Bird Behaviour


WITH regard to the cock house-sparrow reported in Nature of May 6, 1944, as continually attacking its own reflexion in a glass window, a peacock of mine was a great nuisance because he would fight himself, in windows and the bright parts of cars. I have seen a cock house-sparrow attacking a window, and cases have been reported to me of a male blackbird, chaffinch, robin, dipper (at a house near a stream) and a grey wagtail doing the same. In all these cases the bird appeared to mistake its reflexion for a rival male trespassing on its territory and strove long and steadfastly to expel the intruder.

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