This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Feathered Serpent (Mesoamerican)
The earliest representations of feathered serpents appear in the Olmec culture (c. 1400–400 BC). The Olmec culture predates the Maya and the Aztec. This cultural enclave extended from the Gulf of Mexico to Nicaragua. Most surviving representations in Olmec art, show the Feathered Serpent as a crested rattlesnake, sometimes with feathers covering the body and legs, and often close to humans.
It is believed that Olmec supernatural entities such as the feathered serpent were the forerunners of many later Mesoamerican deities, although experts disagree on the feathered serpent's religious importance to the Olmec. in the Olmec tradition, images of serpents with avian characteristics were often represented in several types of artifacts and monuments.