Before he was identified as an indigenous god ... the Aztec name, comes from the Nahuatl language, combining quetzal, a species of brightly feathered bird, and coatl, “snake.” ...

(Rebecca Stacey) "The two heads in this snake is the symbol of dualism ... snake's connection to the Aztec gods, and especially to the great feathered serpent god, Quetzalcoatl: "The snake ...