IN the course of my study of the songs of birds, I have come across a factor in the make-up of the song of the Chaffinch (Fringilla c. gengleri), which, from the complete absence of any reference to it in such essays on bird song as I have read, would appear to be not generally recognized. The Chaffinch's merry rattle is familiar to all, and that individual birds differ considerably in their arrang...

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