Woodduck flank feathers, the classic material for Catskill-style dry fly wings and tails, and for legs and tails on nymphs and soft hackles.

• Lemon Woodduck (WD1): the barred, lemon-tan flank used on Light Cahills, Hendricksons and Quill Gordons
• Black Barred Woodduck (WD2): crisp black-and-white barring for tails, legs and wings