Question: Taking several notable real life inspirations from the animal kingdom I like to design a realistic Dragon towering any creature ever lived but has a nasty habit of generating sonic boom every where in its wake. What are the prerequisites my Dragon have to evolve in order to attain supersonic flight? 

I think it's must have close to a mammal blood circulation to supply ample oxygen to its already effective muscular system and is warm blooded like a cheetahs to give it energy for sudden rush of adrenaline, a crocodiles eyelids to cover it eyes, and so on. My concern is that this colossal winged breast would be too heavy and its skeletal structure have to be augmented naturally through evolution but I have no clues how any animal can survive unhurt after performing such a earth shattering feat any ideas? No tech pls and absolutely no thunderpants!

Answer: 
What if the dragons utilize their standard, magically hot fire to **modify themselves** for supersonic flight?

Arcane knowledge of metallurgy and surgery, passed down through the ages, is used to augment their bones with titanium alloys bathed in dragonfire, strengthening their frames for the ordeal while being hollowed to reduce weight. Scales are reshaped and smoothed to reduce friction, and re-enforced on the leading edge to take the brunt of supersonic flight.

Tanks are added to artificial structures, and the dragons use magic to purify and store enhanced rocket fuel that they then use to literally rocket themselves to supersonic speeds.
Well, the big problem here is air resistance. Falling objects top out at a speed of somewhat above 500 km/h because of air resistance. Sound of speed is 1200 km/h. So it would need immense energy to speed up above that limit. Luckily there is an easy way around it: just decrease the air pressure. To get still enough oxygen to support big creatures the percentage of oxygen in the atmosphere has to be increased. But all that are possibilities and would it make easier to achieve higher speeds. Still, [most birds reach their highest velocity in dives](http://en.wikipedia.org/wiki/List_of_birds_by_flight_speed), so you may want to let the dragon break to supersonic speeds while make an diving attack from a higher flight position.