Smallest things are cute provided they will not harm anybody. And there is this smallest fish which can be found in Indonesia and it says it can survive in EXTREME drought. It also lives in peat swamp. This fish also is known to be the smallest vertebrae and part of Paedocypris genus. This anglerfish photocorynus spiniceps (male) is documented 6.2-7.3mm (maturity). Well, to know more about this, just visit answers.com/topic/smallest-organisms and go to SMALLEST FISH.