Dragon Classification

Why there are so many different creatures called "dragons"? The first thing to note is the common draconic traits that you must look at. I have never come across a dragon that possess all of these traits.
Major Traits - the most common
  • Reptilian Traits
    Most dragons have at least one or two reptile-like traits to them. Things like scales, snake-tails, snake heads, reptilian bodies, and so on all apply. Other things to note is if the story the dragon is in related it to a snake or other form of reptile, be it through behavior or appearance.
     
  • Flight
    Many dragons have, had, or will have the ability to fly. For instance, some Chinese dragons can not fly, but that is because they are too young and are not mature enough to do so. Wings are not required for dragon flight in some instances.
     
  • Water Connection
    Close connections with water is another major trait of the dragons. The dragon might live in the water, spew water, or have emerged from some sort of nearby water source.
     
  • Supernatural Powers
    Supernatural powers include such things as magic or super-strength. The power does not necessarily have to be extreme; for instance, flying without wings or the ability to predict the future.
     
  • Breath Weapons
    Weaponry that comes from their mouth. This includes spitting fire, water, and poison.
     
Secondary Traits - usually the dragon will have these, but it might not be specified or elaborated upon. At other times, the dragon might not have these.
  • Some dragons are connected to the weather. This meaning that they have powers over the weather and perhaps the ability to create storms. The most common ability is that of rain or droughts.
  • Connection with birds is somewhat common among dragons. Some dragons share traits with birds, namely feather wings or feathers in general. Some even have bird's feet.
  • Look and see what the dragon is doing as its primary job. Most dragons guard something, like treasure, maidens, secrets, towns, forests, and so on and so forth. Sometimes these jobs are assigned to them by gods or goddesses while others appoint themselves.
  • Dragons are usually creatures of power. They usually have high ranks, are gods, or are closely connected to a god or goddess of some kind. Usually they are servants to people of power as well, but more commonly to gods.