It wears a face "mask" on its butt. The reason why is genius, and there's definitely more to these maggots than meets the eye ...

There's a creature scurrying across your face. Right now ... same time European and East Asian humans parted ways. Pretty handy. So when it comes down to bugs crawling on you, it could be a ...

The bugs latch onto human (and animal) faces to suck their blood. The bugs then tend to defecate after they bite, which can lead their parasite-containing feces to enter the victim's bloodstream.