Yian Kut-Kus feed on worms, insects, and Neopterons. They use their beaks to scoop into the ground and dig out their prey. Usually after feeding, they may leave behind a hole in the ground and may even leave behind a scale, telling hunters that one is/was in the area.
During breeding season, female Yian Kut-Ku grow feathers on their abdomen so they can keep their eggs warm.
Yian Kut-Ku eat stones similar to Hypnocatice in order to help them digest food.
Their ears are used to intimidate potential threats.
Wherever Yian Kut-Ku are living at, Yian Garuga aren't to far away from them.