This is amazing, those things are an absolutely nasty parasite from out of a sci-fi horror movie. If you drink contaminated water with them it releases its larva into your body which burrow out of your digestive systems into your body consuming your nutrients for a year or more as it grows, then migrates towards your legs and creates debilitatingly painful blisters trying to force its way out over the course of weeks, and when you submerge the wound in water to relieve the burning pain it releases its larva into the water to infect others. Also don't try to pull it out even when its halfway out of your body or it will snap and die and give you a super nasty infection as it decays inside of you.