Natural and unnatural enemies: Sparrows, bulbuls, and Japanese white-eyes have become known as the "three treasures of the city." If these three can still be found around, it means the city is still a suitable living environment for people.
天敵加人敵麻雀、白頭翁和綠繡眼被稱之為「都市三寶」，有它們蹤影的城市，表示這個地方還適合人居住。