The Comazotz

In Mayan Mythology, this evil mythical creature was a gigantic vampire bat said to be the same size as that of a full-grown human male, sometimes even much larger.

 It would randomly and suddenly go on the attack and suck victims dry of their blood.  Just as a real bat, he only came out during the night and terrorized the local people.

During the day, the Mayan people felt safe as they believed they spent their daylight hours existing somewhere out of sight as a stone statue.

"CUZ YOU KNOW HUMANS BELIEVE EVERYTHING"