Okay, so they are actually called spittle bugs, but these little insects actually use spit to make their nests. I had no idea that bugs did that until my daughter and I went on a girl scout nature hike. Through the trees and over creeks we went (didn't I just do this yesterday with my son?), until the naturalist found a gewey clump of insect eggs.
"Look," she said, "bug spit!"
"Ewwwwww!" all of the girl scouts exclaimed. "Disgusting!"
"Hmmmm, " I mused. Now when I go for walks in the woods I have to watch out for animal poop and bug spit. Great!