Mongolian Death Worm
This particular creature is like something out of a nightmare, but it is also one of the ones on this list that could very well be a real thing. Many reports put this scary worm like creature living in the Gobi Desert. It is said to be 2 to 5 feet in length and some reports even claim that it can spit acid that is deadly to humans. Even more scary, the Mongolian Death Worm is said to travel underground.