Standing at a maximum of 0.059 inches (1.5 mm), tardigrades – also called moss piglets or water bears because they live in water and like to hang out in moss – can withstand intense radiation, boiling water and ridiculously cold temperatures just above absolute zero. Some even fare well in Space, making them the cutest toughest animals ever.
![Adult tardigrade through scanning electron microscope [credit: Goldstein Lab]](http://salamanderhours.com/wp-content/uploads/2013/05/Adult_tardigrade.jpg)
Adult tardigrade through scanning electron microscope [credit: Goldstein Lab]
Tardigrades pull this off by undergoing cryptobiosis, a process in which they reversibly shut down their metabolism when a dangerous environmental condition arises. Once the condition subsides, they turn their metabolism ‘back on’ again and simply go about their plant and bacteria-eating business (although one species also eats rotifers, nematodes and other tardigrades).
Here’s a video that explains how the tardigrade got its street-cred.
And finally, here’s an awesome illustration that sums it up perfectly, courtesy of Beatrice the Biologist:
![The water bear doesn't care [credit: Beatrice the Biologist]](http://salamanderhours.com/wp-content/uploads/2013/05/waterbeardoesntcare-901x1024.jpg)
Water Bear doesn’t care [Credit: Beatrice the Biologist]






















