Gold Dragon in Flight
A Dragon has fairly heightened senses. They have exceptional eyesight, sense of smell, and hearing. Dragons are capable of hearing sound waves to low for the human ear, and can see up to a mile further. As for smell, well... You can't beat perfection.
It is a well known fact that Dragons are capable of breathing fire. Not many people know (or even care, for that mater) how, or why.
Dragons are known to devour the bones of their prey. When broken down, the Dragon's stomach acids mixing with the calcium of the bones created hydrogen. The hydrogen is stored in small pockets in the dragons bones until needed.
Of course, bones provide little calcium, so often Limestone, or Firestone as it is known to dragons, is eaten and corroded. If a dragon has had it's fill of hydrogen, it keeps bones lying around it's lair for later.
When a dragon wants to summon up it's fiery breath, it draws the hydrogen from it's bockets, by flexing a special set of muscles. The hydrogen is drawn into the lungs, where it is blown out as a normal breath.
On the roof of a dragon's mouth is a small organ called a Thor's Thimble. When flexed, the Thimble sparks an electrical charge, igniting the hydrogen, and creating a briliant flame.