Animal food of capercaillie (Tetrao urogallus) and black grouse (Lyrurus tetrix) in autumn
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Helminen, M., & Viramo, J. (1962). Animal food of capercaillie (Tetrao urogallus) and black grouse (Lyrurus tetrix) in autumn. Ornis Fennica, 39(1), 1–12. Hämtad från https://ornisfennica.journal.fi/article/view/132668