Could a Creature Breathe Fire?
Unfortunately, No Documented Animal Has the Ability to Breathe Fire, but There Is One Group of Animals That Is Widely Accepted as Those That Come Closest to...
Unfortunately, no documented animal has the ability to breathe fire, but there is one group of animals that is widely accepted as those that come closest to doing so: bombardier beetles.
What animal can breathe fire?
Move over, Komodo and Bearded dragons: the Bombardier Beetle is the closest we've found to a fire-breather. The closest equivalent is probably the Bombardier beetle (Brachinus species).
How would a dragon breathe fire?
Dragons would have two sacs with holes that enter to their mouths. Inside one sack live organisms (like yeast) that produce ethanol. Inside the other lives bacteria that produce sulfuric acid. These two gases are allowed to mix inside the dragon's mouth, just before it breathes fire.