Diatrymon

Diatrymon is an Ancient Bird Digimon. It possesses powerful leg strength, and is called a living fossil. Its wings do not have enough surface area for it to fly, but in their place, it is endowed with legs that have powerful physical strength, and it is capable of sprinting at speeds exceeding 200 km/h. Also, it has an extremely ferocious personality, and a habit of regarding anything that moves as an enemy and swooping down on it. Also, the feathers that cover its whole body contain metal, so it seems it's difficult to inflict damage to Diatrymon barring the greatest of attacks.[1]