Eurasian Eagle-Owl (Bubo bubo) Science Article 4
[…]. Since 1989, we have monitored the Eagle Owl population of the provinces of Alicante Rearing second broods is unlikely for large birds of prey because they lay few eggs, have low feeding rates and nestlings have a slow growth (Klomp, 1970; Newton, 1979). All of this accounts for long, energetically demandingbreeding seasons. Accordingly, the period between laying and independence of the young for the Eagle Owl spans over four months (Mikkola, 1983). […].
Martinez, J. A., Martinez, J. E., Perez, E., Zuberogiotia, I. & Izquierdo, A., Ardeola 50(1), 2003, 77-79