The word toughest means not strongly built, but suggests it's adaptive nature.
Measuring a meagre 1.5mm in dimensions, this animal well assumed as the last surviving creature on Earth.
It is capable of existing in conditions ranging from boiling water to frozen water and also in desert.
They feed on algae for their survival.
They can survive without water for decades together!!
For more interesting facts about this creature, check out the link given below
http://tvblogs.nationalgeographic.com/2014/03/19/5-reasons-why-the-tardigrade-is-natures-toughest-animal/
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