Zuberogoitia, I., Zabalo, J., Hidalgo, S., Azkona, A., Castillo, I., Martínez, J.A. and Martínez, J.E. 2007. Seasonal dynamics in social behaviour and spacing patterns of the Little Owl Athene noctua. Ornis Fennica. 84, 4 (Dec. 2007), 173–180.