Collared falconet 
(Cắt nhỏ bụng hung, Microhierax caerulescens)

The collared falconet (Microhierax caerulescens) is a species of bird of prey in the family Falconidae.

Falco: Hawk, eagle (Late Latin).
Microhierax Greek mikros small; hierax hawk.
caerulescens: Latin caeruleus : dark blue likely from caelum, "sky."; darkish green or blue; cerulean;