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Butastur is a genus of birds of prey in the family Accipitridae.

1/ Grey-faced buzzard (Diều Ấn độ, Butastur indicus)
2/ Rufous-winged buzzard (Diều xám, Butastur liventer)

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.

Grey-faced buzzard (Diều Ấn độ, Butastur indicus)

The grey-faced buzzard (Butastur indicus) is an Asian bird of prey. 
This bird species breeds in Manchuria, Korea and Japan; and winters in South-east Asia.
A small raptor: 41–46 cm (16–18 in) in length. 
Traits:
- Gular stripe;

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.

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.