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Nisaetus, the crested hawk-eagles, is a genus of raptor in the subfamily Aquilinae, found mainly in tropical Asia.They were earlier placed within the genus Spizaetus but molecular studies show that the Old World representatives of that genus are closer to the genus Ictinaetus than to the New World Spizaetus (in the stricter sense).
In limited samples, tail length was reported as 240 to 278 mm (9.4 to 10.9 in) and tarsus length from 100 to 103 mm (3.9 to 4.1 in). [24] A sample of 6 females averaged 37.9 mm (1.49 in) in the length of the rear hallux-claw, the main killing apparatus of most accipitrids, while 7 males averaged 32.3 mm (1.27 in).
Wallace's hawk-eagle (Nisaetus nanus) is a species of bird of prey in the family Accipitridae. It is found in Kra Isthmus , Malay Peninsula , Sumatra and Borneo . Its natural habitat is subtropical or tropical moist lowland forests .
The Flores hawk-eagle (Nisaetus floris) is a large raptor in the family Accipitridae.It is an endemic species to the Lesser Sunda Islands in Indonesia. [2] A member of the genus Nisaetus, it was considered as a subspecies of and conspecific with the changeable hawk-eagle but genetic studies have evidenced it as a legitimate species. [3]
The mountain hawk-eagle (Nisaetus nipalensis) or Hodgson's hawk-eagle, is a large bird of prey native to Asia. The latter name is in reference to the naturalist, Brian Houghton Hodgson, who described the species after collecting one himself in the Himalayas. [4] A less widely recognized common English name is the feather-toed eagle. [5]
The Philippine hawk-eagle or north Philippine hawk-eagle (Nisaetus philippensis), earlier treated under Spizaetus, [2] is a species of bird of prey in the family Accipitridae. Many taxonomists consider the Pinsker's hawk-eagle, a former subspecies, raised to full species status. [3] [4] [5] It is endemic to the Philippines.
A 2008 study based on the geographic isolation and differences in call suggested that this be treated as a full species, Nisaetus kelaarti. [2] When all standard measurements are considered, Legge's hawk-eagles average about 5-10% smaller than mountain hawk eagles, although Legge's tail length is slightly greater on average.
Blyth's hawk-eagle (Nisaetus alboniger) (earlier treated as Spizaetus) [2] is a medium-sized bird of prey. Like all eagles, it is in the family Accipitridae. It can be found in the Malay Peninsula, Singapore, Sumatra and Borneo. [3] It is a bird of open woodland, although island forms prefer a higher tree density.