Take a look at this monster’s round jaw. It looks horrifying. But this creature is fantastic, as it can survive in extreme environments that would kill people and most animals and even survive the vacuum of space. It can stand temperatures of as low as -273 degrees C (-460 degrees F) and as high as 151 degrees C (303 degrees F). It can stay alive after boiling in hot water, and getting 1,000 times more radiation than humans. It can spend almost a decade without water and food. Probably, these monsters would have seized our Planet by now if not two circumstances. On the one hand, they are extremely small (the biggest adults are able to reach a body length of 1.5 mm). On the other hand, they are slow walkers. They are even called Tardigrada because of this.