You do not have even tales of dragons in your world? That's horrible.
We vary greatly depending on breed, but I suppose what we have in common at the bare minimum are that we are hatched from eggs at which point we are generally self sufficient. We have scaly hide, sharp fangs, and sharp talons. We can also fly with the use of our wings, though there are some who have become purely aquatic. Most of us seem to have leathery wings, but I have come to see quite a few who have feathery wings.