VIRKKUNEN, I. Ethological observations on wintering woodpeckers, with special reference on the interactions between different species. Ornis Fennica, [S. l.], v. 44, n. 3, p. 73–77, 1967. Disponível em: https://ornisfennica.journal.fi/article/view/132732. Acesso em: 23 nov. 2024.