 Clutch size is usually two to three eggs, with an incubation period of about 43 days, but on average about 1.23-1.4 fledglings are produced per nest.Nestling mortality is usually due to human disturbance and destruction and nest collapses, secondarily due to predation and siblicide.Fledging is reached at 63-77 days of age but juveniles can linger for an extremely long period, to at least 160 days after fledging.