"Despite their differences, many of the mythical dragons found throughout the world all began as vague serpentine ideas modeled after real creatures, beginning with a snake or some other fearsome reptile. Over time, they acquired more definite and exotic shapes as they absorbed the hopes and superstitions of the local people and borrowed the traits of local animals.
Our short list of creatures and natural phenomenon reveal what may have inspired the look of dragons as well as creatures that are truly dragon-like."
[via Live Science]