Quetzalcoatl is the “Feathered Serpent.”

Tezcatlipoca's brother Quetzalcoatl was the god of wind and rain, reason and introspection. He plays a key role in other Mesoamerican cultures such as Teotihuacan and the Maya.
His nagual was a mixture of bird and rattlesnake, and his name combined the Nahuatl words “Quetzal” (“bird with emerald plumage”) and “Coatl” (“snake”). As the patron of science and education, Quetzalcoatl invented the calendar and books. He was also identified with the planet Venus.

It is believed that together with his dog-headed companion Xolotl, Quetzalcoatl descended into the land of death to collect the bones of the ancient dead. He then poured his blood into the bones and revived humanity.