Guam rail (ko’ko’) | Smithsonian’s National Zoo and Conservation Biology Institute https://nationalzoo.si.edu/animals/guam-rail
The Guam rail (ko’ko’) is a flightless but fast-running bird with a narrow body adapted for running through thick marsh grass, weeds and underbrush. It was once considered extinct in the wild, but populations have been established through reintroductions on Rota and Cocos Island near Guam.
Native Habitat The Guam rail was endemic to Guam and previously found nowhere else