The Popham, Francis

The Shannon, Francis
cul de canard (CDC)  French
  Hairs that grow around the oil gland (sebaceous gland) at the hip of a duck (mainly mallards), they are down and half down. Because oil is used by the bird for preening, the feather is also called the preen feather. CDC are the initials of French "cul de canard." Translated, cul means hip, and canard means duck in English, therefore hip of a duck.
  Flies made of CDC were used over a 100 years ago in a town called Vallorbe in the Jura district near the border of France and Switzerland. The fly was called Mouche De Vallorbe (fly of Vallorbe), and a typical one was the Moustique Fly (mosquito fly). In addition, people in the Franche-Comte district near Vallorbe, mean fly when they say cul de canard.
  Because the barbule of the CDC is long, and the barb (fiber) is soft and light, it floats quite well and serves as a superb material for dry flies. It is also an excellent material for nymph flies, because it holds air bubbles and shines in the water. At present CDC is popular and used for many flies. The winter coat fur of a wild duck is suited best, and about 100 hairs can be taken from one bird. Its natural colors are beige, brown, dun, and black, but they are dyed into various colors and made available on the market. There is no white color in natural CDC. White CDC on the market is taken from a domestic duck or it is a dyed material.
  CDC has been used all over the world only in recent times. In Japan, CDC was introduced in 1986. An interesting speculation by Mr.Toshinori Shimoda suggests that it could have been CDC when Charles Cotton in the 17th century wrote about "the gray feather near the tail of a duck."
  CDC is a popular material now, although it was not easily accepted in the United States. One of the reasons may be that CDC was believed not to restitute after it got wet. The solution however is easy, if a powder type floatant is used it will mostly reshape. A recently developed liquid or jelly type floatant is available on the market can be used on CDC.
ReferenceMicropatterns, 1999 (1994). French fishing flies, 1983 (1969). The fly tyer's benchside reference, 1998. Compleat angler II (in Japanese), 1998 (1676). The fly fisher's illustrated dictionary, 2000.
mallard, Moustique Fly, body feather, Two Feather CDC
Selected Headings

Bighorn River, Montana, U.S.A.
Bighorn River, Montana, U.S.A.