I was out trying for some pictures of insects when I noticed what I thought was a vine tendril moving in the breeze...until I realized that nothing else was moving, and there was no breeze. Closer inspection revealed this strange worm which reminded me a lot of an unhappy experience, when a stray cat I'd taking in, threw up something similar looking on my laundry room floor.
After internet research I've come to the conclusion that this in fact was a horsehair worm. It's life cycle is kind of disgusting to me, frankly, but in a way interesting. If you'd like to hear more about it, and have a strong stomach you can check this out https://www.wired.com/2014/05/absurd-creature-horsehair-worm/