The Great Grey Owl Strix nebulosa-a bird of the northern taiga
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Hildén, O., & Helo, P. (1981). The Great Grey Owl Strix nebulosa-a bird of the northern taiga. Ornis Fennica, 58(4), 159–166. Hämtad från https://ornisfennica.journal.fi/article/view/133079
