CDC Biot Emerger
Hook: Curved-shank, light-wire emerger or scud hook, sizes 18 to 14.
Thread: Olive 6/0 (140 denier).
Trailing shuck: Gray Antron fibers.
Abdomen: Olive-brown goose biot.
Thorax: Olive dubbing.
Wing: One dun and one light cream cul de canard feather.
Note: For the wings you may substitut with grizzly and dun hackles
    wrapped as a paraloop, or a dun hackle  wrapped as a parachute
    around a cul de canard wing post.