Bosa

Tardigrades, often called water bears or moss piglets, are near-microscopic animals with long, plump bodies and scrunched-up heads. ... While strangely cute, these tiny animals are almost indestructible and can even survive in outer space. Tardigrades are nearly translucent and they average about half a millimeter (500 micrometers) in length, about the size of the period at the end of this sentence.
As a tun, a tardigrade can survive for decades or even longer; once immersed in water, the body returns to a normal metabolic state over the course of a few hours. One group of dehydrated tardigrades was reportedly taken from a museum sample of dried moss that was more than 100 years old and brought back to life.