Polish Czech artist EPOS257 created this street art exhibition in Prague featuring the Orghoi khorkhoi, or the Mongolian Death Worm.
For those of you who are blessedly unaware, the Mongolian death worm is the fiercest creature ever to come out of the Gobi Desert. And just how fierce is the worm? Well, let's put it like this: it kills by spewing forth sulfuric acid and discharging electricity. (Graboids, anyone?)
Link - via Wooster Collective
The creature has never been documented to exist.
Or check on Google Maps next time.