Gil's Monster is a Carey variation. It's an oversized one on a #6, 4xl hook.

Me, I'd sooner use one called the Junkyard Dog (JYD), which again, is a Carey variation. I created this one and happened to re-invent the Gil's Monster/Carey variation.

Had good luck with the JYD up at Kappan Lake which is out west on highway 20. First year every fish took us into our backing.

I did mine on a #4, 4xl hook. Pheasant rump for the hackle and tail with avocado angora wool for the body.

The Gil's Monster is the same with a black or green chenille body.

Flies I tied for Hihium were green stimulators and green EHC's with trailing shucks. Did them on #8, 3xl hooks.
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zen leecher