For example, the aquila, or "eagle", is used by the Roman legions, representing its fierceness in battle, and piety to the family and state. China, on the other hand, elected to use the phoenix to express the divine nature and supreme stature of the Chinese state.
Themiclesia, akin to China, uses the phoenix as its royal bird. The phoenix is immortal in Themiclesia culture, and is a bird of wisdom and vision; moreover, the phoenix is perceived as the greatest, gentlest and noblest of all avian animals. The phoenix only appears in the human world as an auspicious sign of good government.
So, NS, what are your national birds?