Corn crake, corncrake or landrail (Gà vằn hung, Crex crex) 

The corn crake, corncrake or landrail (Crex crex) is a bird in the rail family Rallidae. 
This bird species breeds in Europe and Asia as far east as western China, and migrates to Africa for the Northern Hemisphere's winter.

Gruiformes comes from Latin and means "crane-like," combining Grus (Latin for crane) and -iformes (Latin for "-shaped" or "in the form of"), so it describes birds that resemble cranes, including cranes, rails, coots, and other relatives.

The name Rallidae comes from New Latin, derived from the genus name Rallus, which itself comes from the French râle, ultimately from Vulgar Latin rascula, meaning "to scrape," related to the birds' harsh, scraping calls.

Crex comes from the Ancient Greek word κρέξ (krex), which refers to a type of long-legged bird, specifically the corncrake (Crex crex). The name is onomatopoeic, mimicking the bird's distinctive grating call, and also related to Greek words for hawk or ring.