Winter feeding by the Great Tit, Parus major, on eggs of the European pine sawfly, Neodiprion sertifer

Olofsson, E. (1986). Winter feeding by the Great Tit, Parus major, on eggs of the European pine sawfly, Neodiprion sertifer. Ornis Fennica, 63(3), 91–92. Retrieved from https://ornisfennica.journal.fi/article/view/133213