The wispy strands that extend out of the main quill of a feather are called flue. This flue can be curled nicely on many types of feathers. Separate a small section of flue and pull it over a knife or the sharp blade of a pair of scissors. The technique here is very similar to curling ribbon for gift wrapping. Just apply steady but light pressure to avoid tearing or fraying the flue. You can pull the flue over the blade as many times as is necessary to achieve the perfect amount of curl!