Zuberogoitia, I., Zabalo, J., Hidalgo, S., Azkona, A., Castillo, I., Martínez, J. A., & Martínez, J. E. (2007). Seasonal dynamics in social behaviour and spacing patterns of the Little Owl Athene noctua. Ornis Fennica, 84(4), 173–180. Retrieved from https://ornisfennica.journal.fi/article/view/133695