http://en.wikipedia.org/wiki/Wigeon (http://en.wikipedia.org/wiki/Wigeon)
Widgeon flank feathers. Used in the same way as teal duck flank, mostly for winging various flies.
(http://img196.imageshack.us/img196/4576/wigflank.jpg) (http://imageshack.us/photo/my-images/196/wigflank.jpg/)