Tunghavu is a wandering spirit bird. They spend most of their day hiding  and sleeping and mostly hunt and is active by night. Their feathers  when running, make the sound of wind, which cover them from their preys.  When in danger or when they face something new, they rise their  feathers and shake them in order to scare strangers off. Does it work?  idk.

Tunghavu is unfriendly and savage. They are an untamed spirit for now,  unable to speak, or even make a single noise. But finding one of their  feather is a symbol of opportunity and wealth, as their feathers are  pretty expensive since they are very difficult to see /hunt.