{{+1}}Humungus variant{{-1}}
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If your a competition fly fisher, I would go as far as saying, this is one of those flies that you should have in your fly box. It can tied in any combination of colors but for me the three shown below are from my point of view the best options. I have called this a variant as my version includes a red hackle beard which I like because it gives the allusion of a bleeding insect or bait fish and of course it partially camouflages the business end of the hook.
Tied with a woolly bugger tail that allows movement within the fly, a plain, painted or anodised tungsten bead for the head that encourages up and down movement and of course plenty of fleeting colour as it is stripped through the water this fly is very much a top class pulling fly... and very effective in that role.