The Javan hawk-eagle (Nisaetus bartelsi) (earlier placed in Spizaetus) is a medium-sized, approximately 60 cm long, dark brown raptor in the family Accipitridae. Its head and neck are rufous and it is heavily barred black below. This majestic and intricately patterned eagle has a long, black crest on its head; this crest is held almost vertically and is tipped with white. The crown is black, topping a chestnut head and nape.