Sky worm

This species of worm developed a natural defence against those birds hungry for some worms... It grew a pair of wings on its back (or belly, I don't know)!
This way, they don't live under the ground eating humus or inside the trees eating... trees?
Actually, no one knows where they live, but you can notice their presence feeling sudden soft breezes on your body when they pass near you.
Oh, yeah! They are fast!
Due to their aerodinamics, Sky Worms fly really fast (like bullets). You may die if they hit you (like bullets).
Sometimes, they scream (not like bullets... bullets don't scream).