On the activity and food of the Pygmy Owl Glaucidium passerinum during breeding

Mikkola, H. (1970). On the activity and food of the Pygmy Owl Glaucidium passerinum during breeding. Ornis Fennica, 47(1), 10–14. Noudettu osoitteesta https://ornisfennica.journal.fi/article/view/132782