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: 
If you are only concerned about the boom and do not necessarily need flight, you could consider different methods of creating a sonic boom.

One scenario that is not so far-fetched and actually might have happened is that dinosaurs with very long tails could have flicked them like a bullwhip, accelerating the tip of their tails to the speed of sound.

[Here](http://www.nytimes.com/1997/12/02/science/did-dinosaurs-break-the-sound-barrier.html) is an article from '97 about a paleontologist discussing whether it is possible.
A creature meeting your size, speed, and strength requirements would have to be composed of extremely lightweight tissues, most notably including the skeleton (which must be able to handle the physical stresses of accelerating to supersonic speeds rapidly) and muscles (which must be able to convert the creature's biochemical or magical energies into mechanical energy efficiently, rapidly, and at high volume).

The most "realistic" way I could imagine all of these requirements being satisfied is if your dragon looks like a blimp: a giant sack of air that moves short distances by flapping its wings, and naturally floats in the air because its body density is about equal to the surrounding air density. Such a creature might achieve supersonic speeds by rapidy forcing most of the air in its body cavity through a small opening to create jet propulsion. This would also cause the creature to deflate to a narrow, streamlined shape that's more aerodynamic for long, straight flight paths.

We could go into further technical detail, but as you can see the result is a bit ridiculous. Really what I'm saying is you need a fart dragon.