Tom Rosenbauer teaches you how to tie a great mayfly pattern on Facebook Live. Here's the recipe:
Parachute Adams
Hook: Standard dry-fly hook, sizes 12-18.
Thread: Black, 8/0.
Tails: Mixed brown and grizzly hackle fibers.
Wing: White calf-body hair, Para Post, or EP Fiber.
Hackle: One brown and one grizzly hackle.
Body: Gray fur dubbing.
https://www.orvis.com/
https://www.orvis.com/fly-tying
https://www.orvis.com/p/adams-parachute-dry-fly/0356