The clutch size is usually 2, though one egg is not infrequently laid. This species seldom lays three eggs, though there are now a few records of this and even three large eaglets recorded in a nest. Their eggs are largely white but are often sparingly spotted and streaked with brown. In a sample of 120, egg height was measured as , with an average of by in diameter, with an average of . Egg laying dates peak from February to April in France, January in North Africa while in India, the peak may be December to April, sometimes even into May (as in the Himalayas). Incubation lasts for 37 to 41 days in Europe but is estimated at a more prolonged 40-45 days in the more tropical Indian subcontinent. Incubation is mainly done by the female (about 90% of the time) while males mainly capture food. Upon hatching, the eaglets are altricial initially. The first feathers start appearing through the white down at 25-35 days and practically cover the body by 45 days. By the latter stage, the eaglets can normally feed themselves but may be variable in learning ability. Fledgling period is at 56 to 65 days of age (rarely as late as 70 days). The average age at fledging in Spain was estimated at 63 days. Female broods about 90% of the time for first two weeks after first hatching but this decreases to 50% by the end of those weeks. The female attacks potential predators that come near the nest including other raptors. In the Indian subcontinent, they've been seen to escort oriental honey buzzards, crested serpent eagles (Spilornis cheela), bearded vultures, as well as Gyps vultures, conspecifics and corvids away from the eyrie vicinity while the presence of northern plains gray langurs (Semnopithecus entellus) was observed to provoke a fierce defensive attack. However, unlike African hawk-eagles, Bonelli's eagles rarely attack humans at the nest. Males at times have been observed to take a share of the brooding and rarely even feeding the eaglet(s). Caches of food are often stored early on but are quickly depleted and rarely still present latter in the nesting period when the eaglets growth accelerates. The female lingers near nest even after brooding stage. However, the female also tends to take part in prey capture relatively early in fledging period compared to many other eagles. In the latter third of the post-fledging period, the parents are rarely in attendance except when bringing food. The dependence of the young eagles may extend for about 8 to 11 weeks, but has individually varied from 50 to over 120 days. Research on conditions and habitat composition has indicated variation in the post-fledgling dependence stage is derived from habitat quality or from parental skill. However, fledgling body condition seemed to play no major role in this stage. On evidence, the young eagles drift from their parents care independently.