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Animals in one form or another have survived repeated cataclysms. Natural evolution takes place, in any case, and the cataclysms only trip the balance this way or that. Without the cataclysms your Earth's animal species would be different, a different mix, and with some species now long extinct still present. But because these extinct species had survived, others would not have thrived, due to competition. Therefore, beyond protecting nature preserves, do not concern yourself over animal survival. Nature looks after her own.