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The Dark Cahill dry fly is a classic pattern designed to imitate the adult stage of various mayflies, especially those that hatch in the evening or under low light conditions. It’s a versatile fly that works well in many different waters, making it a favorite for targeting trout.

### *Materials Used:*
– *Hook:* Standard dry fly hook, typically sizes 12-18 (e.g., Mustad R50-94840 or TMC 100).
– *Thread:* Black or dark brown, 6/0 or 8/0.
– *Tail:* Dark ginger or dark brown hackle fibers, tied sparsely.
– *Body:* Dark brown or dark gray dubbing, often made of natural fur like muskrat or fine synthetic material.
– *Wings:* Paired upright wings made from dark gray duck quill segments or similar materials to imitate the natural wing silhouette.
– *Hackle:* Dark ginger or brown rooster hackle, palmered around the hook near the wings.

### *Target Trout:*
The Dark Cahill is effective for a variety of trout species, especially:
– *Brown Trout*
– *Rainbow Trout*
– *Brook Trout*
– *Cutthroat Trout*

This fly pattern is particularly useful during evening hatches of dark-bodied mayflies. It’s often fished in slow to moderate currents, where its natural drift can entice surface-feeding trout.