Fragmenta varia
Theophrastus
Theophrastus. Theophrasti Eresii Opera, Quae Supersunt, Omnia. Wimmer, Friedrich, editor. Paris: A.F. Didot, 1866.
Fr. 181
Θ. γοῦν ἐν τῷ περὶ ἑτεροφωνίας τῶν ὁμογενῶν οἱ Ἀθήνησι φησὶν πέρδικες ἐπὶ τάδε τοῦ Κορυδαλλοῦ πρὸς τὸ ἄστυ κακαβίζουσιν οἱ δʼ ἐπέκεινα τιττυβίζουνσιν. (Athenae. 9, p. 390.)