Rufous-winged buzzard (Diều xám, Butastur liventer)

The rufous-winged buzzard (Butastur liventer) is an Asian bird of prey. 
This bird species is a resident breeder of Indochina, Java and Sulawesi. 

Accipitridae from Latin accipiter/accipitri- "hawk".
accipitrinus Latin accipitrinus hawk-like (accipiter: hawk).
The genus name Butastur is a combination of the Latin words buteo (meaning "buzzard") and astur (meaning "a hawk"), referring to a genus of birds that share characteristics of both. The name was created by combining the existing genera Buteo and Astur to describe a type of hawk or buzzard.
liventer: In Latin, livere means "to be bluish" or to "be envious"; venter means "belly," "womb," or "bulge".  Latin liventer bluish, lead-coloured vent.