Short answers, pulled from the story.
The Greek word for dragon, drakon, derives from a verb meaning to see, suggesting these creatures were defined by eyes that never blinked. This etymological root reveals a deep-seated human fascination with the gaze of the serpent, an animal whose eyelids are transparent scales that remain permanently open.
Adrienne Mayor posits that ancient observers in the Siwalik Hills below the Himalayas stumbled upon oversized bones that became the foundation of dragon lore. These discoveries of dinosaur and prehistoric mammal remains were the spark that ignited the imagination of early cultures.
In the Rigveda, the god Indra battles Vritra, a three-headed serpent who represents drought, using his thunderbolt to clear the path for the seven streams of rain. This battle is the most enduring narrative in Indo-European mythology and appears in almost every iteration from the Rigveda to the Edda.
The Chinese dragon, or loong, is the highest-ranking creature in the Chinese animal hierarchy and was the symbol of the emperor. The Emperor of China was the only one permitted to have dragons on his clothing, house, or personal articles, and any commoner who possessed such items was ordered to be executed.
In the Middle Ages, the dragon was transformed into the embodiment of evil, a fire-breathing monster that represented Satan and the forces of chaos. The modern Western image of the dragon developed through the combination of the snakelike dragons of classical Graeco-Roman literature, references to Near Eastern dragons preserved in the Bible, and Western European folk traditions.
The dragon has been reimagined by writers such as J. R. R. Tolkien, Ursula K. Le Guin, and George R. R. Martin. Smaug from Tolkien's The Hobbit is one of the most iconic modern dragons, while dragons in the Harry Potter series by J. K. Rowling are powerful creatures that are both feared and respected.