Thread Black, or match your rib color (yellow shown) 70 denier
Materials
Moose body hair (tail) Natural dark moose body hair (8-10 fibers, stacked)
Floss (body) Lime green floss (2 strands of a 4-strand floss)
Tying thread (rib) Same as tying thread (1 twisted rope)
Calf tail (Trude wing) White calf body hair (1 small tuft)
Dry fly hackle Grizzly (any color works) (1 feather)
How to tie it
Start the thread in the front third of a size 14 dry fly hook and lay a base back to the start of the bend.
Stack eight to ten moose body hairs and tie them in as a tail one shank length long. Bind the butts forward to about halfway to thicken the underbody, then flatten them with a couple of wraps and trim.
Tie in the lime green floss at the bend. Pull a length of bare thread down alongside it, take a wrap to hold it as a rib strand, and park the thread up front.
Wrap the floss forward in one smooth layer to the thread and secure it with a couple of firm wraps.
Twist the reserved thread into a rope and spiral it forward over the body as an open rib. Tie it off and trim. Use black thread here if you want the rib to actually show, a yellow rib disappears against lime green.
Stack a small tuft of white calf tail and tie it in Trude style, lying low over the body and reaching at least one body length back. Use a pinch wrap; if it lies too flat you can lift it and take a wrap underneath. Snip the butts off as close as you can.
Tie in a grizzly dry fly hackle at the back of the head and take three or four close turns forward, deliberately leaving the eye clear.
Tie off, trim, pull everything back, take a couple of wraps rearward for room, and whip finish.