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 to display a symbol on their products that indicates it is kosher, and that this cost is secretly passed on to consumers through higher prices which constitute a "kosher tax." It is mainly spread by antisemitic white supremacist and other extremist organizations. Refuters of this canard state that if it were not profitable to obtain such certification, then food producers would not engage in the certification process, and that the increased sales resulting from kosher certification actually lower the overall cost per item. Obtaining certification that an item is kosher is a voluntary business decision made by companies desiring additional