The Crested Hawk-eagle or Changeable Hawk-eagle, is a bird of prey of the family Accipitridae. They were formerly placed in the genus Spizaetus but studies pointed to the group being paraphyletic resulting in the Old World members being placed in Nisaetus and separated from the New World species. Changeable Hawk Eagles breed in southern Asia in Northern Pakistan across to the Republic of India and Sri Lanka and from the SE rim of the Himalaya across Southeast Asia to Indonesia and the Philippines. This is a bird occurring singly in open woodland, although island forms prefer a higher tree density. It builds a stick nest in a tree and lays a single egg.