Many feathers on a mallard, drake and hen, are under utilised in my mind. Here is one possible use for the mallard drake copper colored throat feathers.
Hook: Kamasan B175 #12
Thread: Benecchi 12/0, black
Hackle: Mallard drake copper throat
Body hackle: Whiting Farms Coq de Leon, medium pardo
Rib: Wire, silver fine
Body: Embroidery yarn, chestnut
Tail: Mallard drake copper throat barbs