How do match the hatch and throw something they haven't seen

Fly Fishing in Ponds, Flies and Techniques

Found a lot of these feathers, they appear to be double with a little worm-like appendix to them. What are they called (the appendixes) and what is their use? : r/Ornithology

Unmatching the Hatch

Unmatching the Hatch

Spinning Into River Walleyes

Requiem for Hatch Matching - Fly Fisherman

Spinning Into River Walleyes

Match The Hatch Fly Fishing

Has anyone attempted to cross breed the different Cubaris Tigers? : r/isopods

How do match the hatch and throw something they haven't seen

7 Tips For Fly Fishing The March Brown Hatch in Montana

You Don't Have to Match the Hatch - Troutbitten

Four Kinds of Fishing Flies

Demystifying The Hex Hatch - Fly Fishing, Gink and Gasoline

Matching The Hatch