一切經音義 4.170

4.170

鴛鴦（上於袁反下於薑反毛詩曰鴛鴦于飛傳曰鴛鴦疋鳥也言其止為疋偶飛則雙飛也）。

鴛鴦 (Mandarin ducks: The upper character has the fanqie 於袁 [yuān]; the lower character has the fanqie 於薑 [yāng]. The Classic of Poetry says: "The mandarin ducks fly." The commentary says: "The mandarin ducks are paired birds, meaning they rest in pairs and fly in tandem").