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The Changeable Hawk-Eagle or Crested Hawk-eagle (Nisaetus cirrhatus) is a bird of prey species of the family Accipitridae. It was formerly placed in the genus Spizaetus, but studies pointed to the group being paraphyletic resulting in the Old World members being placed in Nisaetus (Hodgson, 1836) and separated from the New World species.
Changeable Hawk-Eagles breed in the Indian Subcontinent, mainly in India and Sri Lanka, and from the southeast rim of the Himalaya across Southeast Asia to Indonesia and the Philippines. This is a bird occurring singly (outside mating season) in open woodland, although island forms prefer a higher tree density. It builds a stick nest in a tree and lays a single egg.
The Changeable Hawk-Eagle is a medium-large raptor at about 60–72 centimetres (24–28 in) in length. It is a relatively slender forest eagle with some subspecies (especially limnaetus) being dimorphic giving the name of "Changeable". This, and also a complicated phylogeny further complicates precise identification.
Normally brown above; white below with barring on the undersides of the flight feathers and tail; black longitudinal streaks on throat and chocolate streaks on breast. Some subspecies have a crest of four feathers, but this is all but absent in others. The sexes are quite similar in their plumage, but males are about 15% smaller than females.The underparts and head of juveniles are whitish or buff with few dark streaks.

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