There is a lot of possibility they exsist.. think of a bird.. they contain air sacs inside of them. extentions of the lungs.
kids.britannica.com...
Now, Think of a massive animal such as a dragon.. imagine how big its air sacs could be.. allowing more lift. now there is a bettal and a lizard that
produce a bacteria reaction that produces hydrogen and hydrogen sulfate even methane people produce these as well. Now, for the metal platinum.
I does occur in the soil and is not the only element reactive to hydrogen.. there are even some acids that ignite hydrogen oxygen. believe it of not
people and almost all animals have some degree of platinum or these explosive chemicals/acids. so imagine.. a creature with such strong acids and
light gas componds dying. Brown bears and birds for exsample can complketely decompose within a very short time. so Dragon could theoretically
decompose quite fast due to the required gases to create flames.. Also, in order to be able too swoop down to pray they would have to release some of
these gases.. just like birds, What better way to kill a fleeing enemy by burning it alive when your exsosting your poyency or your just so massive a
ground chance would be Acward...
go to this site as well..
www.valserrie.com...
Hope that helpas you non believers

and for you who are hopeful!
Cheers, (K)