Family Hawks, Eagles (Accipitridae)


Javan Hawk-eagle (Nisaetus bartelsi)


French: Aigle de Java German: Javahaubenadler Spanish: Águila de Java

Spizaëtus nipalensis bartelsi


, 1924,

western Java


Traditionally thought to form a species-group with N. nipalensis, N. alboniger (with N. nanus), N. lanceolatus and N. philippensis (with N. pinskeri). Sometimes considered to be a race of N. nipalensis, but clearly distinct. Monotypic.



Descriptive notes

56–60 cm; published data on body mass absent; wingspan 110–130 cm. Medium-sized hawk-eagle, with prominent blackish crest, dark upperparts, white throat with dark... read more


Generally silent, except in the breeding season. Commonest call is a bisyllabic, shrill, drawn-out... read more


Humid tropical forest; mainly in primary forest, but also to lesser extent in secondary forest and... read more

Food and feeding

Hunts mostly from perch in forest canopy, occasionally from flight, capturing prey on ground or in trees. Takes a wide variety of... read more


Egg-laying has been reported from Dec–Jul. Nest built by pair out of sticks and lined with green leaves, placed in tall tree 15... read more


Adults largely sedentary; juveniles and immatures move through second-growth habitats during... read more

Status and conservation

ENDANGERED. CITES II. One of rarest of all raptors. Population estimates, based on recent surveys, range from 200 to 270–600 breeding pairs, or up to 900 individuals... read more

Recommended citation

Clark, W.S., Boesman, P., Marks, J.S. & Sharpe, C.J. (2020). Javan Hawk-eagle (Nisaetus bartelsi). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from on 27 February 2020).