Cipactli is a big scary monster in the religion and mythology of the ancient Aztecs, who lived in what is now Mexico about 500 years ago. Aztecs believed that Cipactli was one of the first creatures to exist in the universe. According to their stories, Cipactli had a big mouth filled with lots of sharp teeth, and a long tail that it used to swim around in the primordial waters of the universe. The Aztecs thought that Cipactli was responsible for creating the solid land on Earth, because it had been cut into pieces by the gods and these pieces were used as the foundation for the world we live in today. In their religion, Cipactli was sometimes worshipped as a god, but at other times it was feared as a dangerous force that could cause earthquakes, storms, and other disasters. Essentially, Cipactli is a legendary monster from the mythology of the ancient Aztecs.