Editing Philippine eagle (section)

===Reproduction===
[[File:Philippine Eagle with nest.jpg|thumb|A Philippine eagle nestling]]
The complete breeding cycle of the Philippine eagle lasts two years. The female matures sexually at five years of age and the male at seven. Like most eagles, the Philippine eagle is monogamous. Once paired, a couple remains together for the rest of their lives.<ref name=" Yearbook09 "/> If one dies, the remaining eagle often searches for a new mate to replace the one lost.<ref name=" PFoundationEcology "/>

The beginning of courtship is signaled by nest-building, and the eagle remaining near its nest. Aerial displays also play a major role in the courtship. These displays include paired soaring over a nesting territory, the male chasing the female in a diagonal dive, and mutual talon presentation, where the male presents his talons to the female's back and she flips over in midair to present her own talons. Advertisement displays coupled with loud calling have also been reported. The willingness of an eagle to breed is displayed by the eagle bringing nesting materials to the bird's nest. Copulation follows and occurs repeatedly both on the nest and on nearby perches. The earliest courtship has been reported in July.<ref name=" PFoundationEcology "/>

Breeding season is in July; birds on different islands, most notably Mindanao and Luzon, begin breeding at different ends of this range.<ref name=" Yearbook09 "/> The amount of rainfall and population of prey may also affect the breeding season.<ref name=" Yearbook09 "/> The nest is normally built on an emergent [[dipterocarp]], or any tall tree with an open crown, in primary or disturbed forest. The nests are lined with green leaves, and can be around {{convert|1.5|m|ft|abbr=on}} across. The nesting location is around {{convert|30|m|ft|abbr=on}} or even more above the ground.<ref name=" Yearbook "/><ref name=" Chandler "/> As in many other large raptors, the eagle's nest resembles a huge platform made of sticks.<ref name=RaptorsWorld/><ref name=" Chandler "/> The eagle frequently reuses the same nesting site for several different chicks.<ref name=" Yearbook "/> Eight to 10 days before the egg is ready to be laid, the female is afflicted with a condition known as egg lethargy. In this experience, the female does not eat, drinks much water, and holds her wings droopingly.<ref name=" PFoundationEcology "/> The female typically lays one egg in the late afternoon or at dusk, although occasionally two have been reported.<ref name=" Chandler ">{{Cite book| last1 =Chandler| first1 = David| last2 = Couzens| first2 = Dominic| title = 100 Birds to See Before You Die| place= London| publisher = Carleton Books| year = 2008|page = 171|isbn = 978-1-84442-019-3 }}</ref><ref name=" PFoundationEcology "/> If an egg fails to hatch or the chick dies early, the parents likely lay another egg the following year. Copulation may take place a few days after the egg is laid to enable another egg to be laid should the first one fail. The egg is incubated for 58 to 68 days (typically 62 days) after being laid.<ref name=RaptorsWorld/> Both sexes participate in the incubation, but the female does the majority of incubating during the day and all of it at night.<ref name=" PFoundationEcology "/>

Both sexes help feed the newly hatched eaglet. Additionally, the parents have been observed taking turns shielding the eaglet from the sun and rain until it is seven weeks old.<ref name=" PFoundationEcology "/> The young eaglet fledges after four or five months.<ref name=" Chandler "/> The earliest an eagle has been observed making a kill is 304 days after hatching.<ref name=" PFoundationEcology "/> Both parents take care of the eaglet for a total of 20 months and, unless the previous nesting attempt had failed, the eagles can breed only in alternate years.<ref name=RaptorsWorld/><ref name=" Yearbook09 "/> The Philippine eagle rivals two other large tropical eagles, namely the [[crowned eagle]] and harpy eagle, for having the longest breeding cycle of any bird of prey.<ref name=RaptorsWorld/><ref name="Brown">''Eagles, Hawks and Falcons of the World'' by Leslie Brown & Dean Amadon. The Wellfleet Press (1986), {{ISBN|978-1-55521-472-2}}.</ref> Even nests have no predators other than humans, as even known nest predators such as palm civets and macaques (being prey species) are likely to actively avoid any area with regular eagle activity.<ref>Delacour, J., E. Mayr. 1946. ''Birds of the Philippines''. New York: The MacMillan Company.</ref>