Eastern marsh harrier (Diều đầu trắng, Circus spilonotus)

The eastern marsh harrier (Circus spilonotus) is a bird of prey belonging to the marsh harrier group of harriers.

The breeding range of the bird covers north-east China, Mongolia and south-east Siberia (as far west as Lake Baikal), and with some in northern Japan.
The wintering range of this species includes southern China, Taiwan, Korea, southern Japan, northeast India, Bangladesh 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. 
Spilonotus is a Greek-derived term for a biological name that means "spot-backed".
The origin is from the Greek words spilos (σπίλος), meaning "spot," and notos (νῶτος), meaning "back".