Tardigrade

What creature on earth is able to go for decades without food or water, to survive temperatures from near zero to well above the boiling point of water, to survive pressures from near zero to well above that on the ocean floors, and to survive direct exposure to dangerous radiations?
Oh, and they can repair their own DNA and reduce their body water content to a few percent.
It's the earth's weirdest creature, the tardigrade.
Click for photo and more info   http://www.popsci.com/science/article/2013-03/if-earth-were-hosting-alien-species-what-it-would-look