Hook: 3 or 4 X long streamer hook. (Mustad 79580 works well)
Thread: Red (210 denier for tying on the tail. 70 denier to tie in the mallard flanks.
Bead-head: Any color, size of bead to match hook size.
Weight: Lead wire
Tail: Squirrel tail
Wing: Four Mallard breast feathers. Colors can vary.
Lateral line: Krystal flash
Eye: Painted

Complete step-by-step with pictures at Dub the Thorax.