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  1. Farnboro John

    Common, Scottish, and Parrott Crossbills - separation by excitement call?

    I can't see that these few calls are the whole story. Having been told I must expect to believe in Common Crossbill call variation from Type A to Type Z3XXX or whatever the current range is, the supposition here is that Crossbills with that wide a range of calls have only three (A, B, E)...
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