NASA says: "Perchlorates are found naturally on Earth at such places as Chile's hyper-arid Atacama Desert. The compounds are quite stable and do not destroy organic material under normal circumstances. Some microorganisms on Earth are fueled by processes that involve perchlorates, and some plants concentrate the substance. Perchlorates are also used in rocket fuel and fireworks."
So, if we're following this correctly*, there could possibly be Martian animals with perchlorate-fuelled metabolisms, living off perchlorate-concentrating plants. Though there would be a significant risk of these creatures catching fire or exploding if upset - not unlike Terry Pratchett's Discworld dragons, in fact.
* SCIENCE QUALITY WARNING: The chance that we are following this correctly is roughly equivalent to that of a man with no arms throwing a handful of jelly through a falling doughnut at fifty yards without touching the sides.
Balna Watya: I think the climate is a reflection of the divine balance of power. [...] When the ice god is resurgent and his people (the wights and white walkers) are awake, the cold stretches across the entire continent and you get 100 foot snow falls. In more normal times, when the moderate faith of the Seven and the maesters rules, you get relatively moderate and normal winters. This explains the title of the book, A Song of Ice and Fire.
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