Mellow, B. K, Horton, K. W, Catley, G. P, White, C. M. N, Tetley, H, Venables, L. S. V, Dobie, W. H, Witherby, H. F, Mellow, B. K, Horton, K. W, Tetley, H, Witherby, H. F & Venables, L. S. V / March 1938 – vol. 31, issue 10–⁠335

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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