Barn owls are monogamous, pairs being faithful to breeding sites (often old buildings or abandoned houses), using the same one for years. No nest is built, rather regurgitated pellets serve to cradle the eggs. Altricial young are fed by both sexes. Mortality among the young is very high: nests are insecure, eggs and young fall to the ground, and sibling rivalry can lead to starvation, trampling to death or even cannibalism by a nest mate. The young fly in about 60 days and are independent in about 10 weeks.