Pallid Harrier 
(Diều Bụng trắng, Circus macrourus)

The pallid harrier (Circus macrourus) is a species of harrier, a bird of prey in the family Accipitridae. 
This bird species breeds in southern parts of eastern Europe and central Asia and Iran and winters mainly in India and southeast Asia.

accipitrinus Latin accipitrinus hawk-like (accipiter: hawk).
In both Latin and Greek, the root of the word "circus" means "ring" or "circle". The Latin word circus comes directly from the Greek word κίρκος (kírkos), which also means "circle" or "ring". This etymology describes the shape of the ancient Roman arenas and the modern performance spaces where circuses are held. 
Macrourus is derived from the Ancient Greek words makros ("long") and -ouros ("-tailed"), meaning "long-tailed". The term is not Latin; it was borrowed from Koine Greek.