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Fox, A. D., & Balsby, T. J. (2016). size does matter: large-race Bullfinches Pyrrhula pyrrhula pyrrhula dehusk sunflower Helianthus annuus seeds at twice the rate of small-race P.p. coccinea individuals. Ringing & migration, 31(2), 98–101. http://access.bl.uk/ark:/81055/vdc_100044314944.0x000025