Changeable hawk-eagle 
or crested hawk-eagle, marsh hawk-eagle or Indian crested hawk-eagle
(Diều đầu nâu, Nisaetus cirrhatus) 

The changeable hawk-eagle (Nisaetus cirrhatus) or crested hawk-eagle is a large bird of prey species of the family Accipitridae. 

"Changeable" is from a wide variation of plummage: from pale to dark, varying on molt and age change.

Accipitridae from Latin accipiter/accipitri- "hawk".
The genus name Nisaetus combines the Medieval Latin nisus for a sparrowhawk with the Ancient Greek aetos meaning "eagle".
The specific epithet cirrhatus is from Latin cirratus meaning "curly-headed".