Mount a #10 down-eye dry fly hook and run a smooth base of flat olive thread from behind the eye back to the bend.
Stack a generous clump of moose body hair and tie it in as a tail one full shank-length long, starting with loose turns and then squeezing down; bind the butts forward to about the one-third point from the rear to build an even underbody.
Tie in a strand of yellow super stretch floss at the rear and wrap it forward in tight, slightly overlapping turns, stretching it hard so each turn cuts a crisp segment; taper the body slightly thicker toward the front and tie off at the 70% point.
Strip the fuzz from the base of a mallard flank feather, grip the tip, and fold all the remaining fibers down so the tips stack even; measure the wing to the body length and cut the stem off snug.
Split the folded tip down the middle to give two wings, trim the little tips clean, and mount the wings on top at the 70% point so they lie back over the body rather than standing upright.
Tie in an olive dry fly saddle hackle in front of the wings and take six or seven generous turns for flotation, tying it off behind the eye.
Trim any stray fibers, whip finish a small head, and add a drop of head cement.