Cul de canard Cul de canard Cul de canard (CDC) (French for "duck bottom") are the feathers from the back of a duck directly around the preen gland (uropygial gland); they are very buoyant due to preen oil produced by the preen gland. They are used when tying dry flies for fly fishing. They owe their buoyancy to their proximity to the ducks preen gland which secretes an oil distributed by the duck as a cleaning and waterproofing measure. It is unnecessary for the angler to add additional oil by way of floatant. Flies incorporating CDC are easy to dress requiring no floatant
Antisemitic canard sales from consumers (both Jewish and non-Jewish) who look for kosher certification when shopping, and is actually specifically sought by marketing organizations within food production companies. A canard found in "The Protocols of the Elders of Zion", but dating to before that document, is that Jews are more loyal to world Jewry than to their own country. Since the establishment of the state of Israel, this canard has taken the form of accusations that Jewish citizens of countries such as the United States are more loyal to Israel than to their country of residence. In the book The Secret Relationship