This question already has an answer here:
Ok, so I was wondering if an animal ever evolved to the point that it had the capabilities to breathe or shoot fire say up to 300-500 degrees. What would it need to protect itself from its own heat as well as able to use it as a hunting tool?
Would it be something similar to spitting cobra or would it have around 3 different organs that store a key component for fire breathing? Would it have an air sack, some type of gas pocket, a "spark" component near its mouth?