The young eaglet fledges after four or five months. The chick fledges at seven or eight weeks. After hatching the chick fledges after 60 days. The squab fledges after another three weeks. The chick fledges at night, flying out to sea alone. After the chick fledges, the male destroys the nest. As soon as the first brood fledges the female will assist in additional nest building. The eggs hatch in 15 days, with a further 18 days until the cuckoo fledges. Overall, a chick eats about before it fledges. The lowest number of fledges was in 2011 with just 99 of the birds fledged.