I HAVE paid particular attention to the singing of Crossbills (Loxia c. curvirostra) for some years, on and off, and I find that the song can be divided into four main varieties. In attempting to describe these songs below, I use the two sound descriptions squeeze and whit. The first is a prolonged harsh wheezing, very reminiscent of a note frequently used by the Greenfinch (Chloris c. chloris). ...

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