I am very news to ducks, but we just took in a blue swedish that is thought to be a Drake, however he doesn't have a Drake feather? Is this typical? Our black cayuga is younger and has a very obvious Drake feather. He does have that same raspy sounding quack like our black cayuga. I would be thrilled to find out he is a female but his raspy quacks makes me think otherwise.. what's everyone's opinion?