Just one quibble 'cause I'm actually an evil pedant in disguise. Most archeologists studying Mesoamerican cultures think that the form for Quetzalcoatl was inspired by my pseudonym-sake: the Central American Quetzal (Pharomacchrus mocinno). It is known that many of the really fancy Aztec headdresses were composed primarily of quetzal feathers (why not? the birds have a 2 meter tail!). They (the birds) were considered royalty (or at least reserved for royalty) by the Maya, among others. When it flies, it undulates very like a snake with wings - just like the representative drawings of Quetzalcoatl.