I had never seen these creatures until a few years ago: I'm told they're called Navy worms.
Navy worm on the left; ant on the right. Perhaps they're in love.
Whatever the name, they are EVERYWHERE at the lake again this year. They cluster at corners of the fence, climb up onto cars, and fall out of the trees like wiggling raindrops. Voracious eaters of leaves, they don't seem to be interested in biting any other living thing.
They are a little creepy, especially in such large numbers, and the expansive damage they leave behind is massive, but up close I find them kind of, dare I say, cute.
I'm probably going to regret that one day, when the world is taken over by navy worms, and all the trees die, and they turn to eating humans. Until then, though, they make fun photo subjects.