Corvus is a widely distributed genus of passerine birds ranging from medium-sized to large-sized in the family Corvidae.
It includes species commonly known as crows, ravens, and rooks.
The genus name is derived from the Latin corvus meaning "raven".

1/ Large-billed crow (Quạ đen, Corvus macrorhynchos), formerly referred to widely as the jungle crow
The scientific name macrorhynchos is from Ancient Greek for "large beak". The species is sometimes known by the common name thick-billed crow. 

2/ Collared crow (Quạ khoang, Corvus torquatus), also known as the ring-necked crow or white-collared crow

3/ Carrion crow (Quạ mỏ nhỏ, Corvus corone) 
The epithet is from Greek korone, "crow".