Electric eel...yeah
Okay then; answer me this: Would something evolve in nature to breath out fire? How bout have the strength to push a glacier? To spew ice from its mouth?
explain the bombardier beetle or the skunk. Adaptations occur. A fire spewing or breathing animal is possible. Maybe another set of lungs that holds intensely hotter air. I could see an opposite chemical reaction occur that is could instead of heat. We've got electric and bio-luminescent creatures too. And before asking how an animal could evolve to self-destruct or explode, look into Malaysian ants.