Very few are lucky enough to get life breathed into them. Animals are one being, plants another. But plants and animals eventually get old and die, the life leaving them and going elsewhere.
Bu there are others.
Others who are opposite.
Once they were lifeless, but now they live, breath and move. They are basically living flames.
And no--they are not just regular fire, because fire moves. They are actual living beings.
They are quite rare, and as such, humankind has never been able to prove their existence, and so there are many disbelievers in the world. But they say that if you believe enough, wish hard enough, and do good enough, you might just get visited by one.

For RosiePlayz's skin contest. (Found here: http://www.planetminecraft.com/forums/magical-creatures-skin-contest-t433059.html)