The combination of the heat from Byrnchik's feathers and the cold from Froschik's feathers draws the two species together. When Byrnchik down is shed, it is often used to make winter clothing.
Its feathers give off a slight heat. If you see a flock of Byrnchik, a flock of Froschik will be nearby.
A highly sociable Pokemon, its preferred company are humans and Froschik. Shed Byrnchik feathers are used in winter clothing.