线尾燕 Traditional form: 線尾燕 Pinyin (reading): xiànwěiyàn Definitions: (bird species of China) wire-tailed swallow (Hirundo smithii) Characters: 线 - line, thread, wire; clue, trail 尾 - tail; extremity, end; back, rear 燕 - lovebird, swallow Traditional characters: 線 - line, thread, wire; clue, trail 尾 - tail; extremity, end; back, rear 燕 - lovebird, swallow