The flute (recorder) has long been used to imitate
birds in music, as many of the references to Purcell
and Handel and their contemporaries demonstrate. Lines
like "Hark how the songsters of the air", "Hark how the
lark and linnet sing", "Hark! how the songsters of the
grove", "Hush ye pretty warbling quire" say it all.
Henry Purcell's "Timon of Athens" (1694) calls for "a
Symphony of Pipes [ie alto recorders] imitating the
Chirping of Birds".
Although originally written for Chorus and Recorders, I
adapted this piece for Concert (Pedal) Harp and
Woodwinds (2 Flutes & 2 Oboes).