31. Tardigrades are indestructible.

This microscopic animal is one the world's smallest animals, measuring in at 1.5mm. But it's been found to survive in the most extreme conditions, including the bottom of the ocean and Mount Everest. Tardigrades are also the first animal to survive in space. Scientists believe it’s due to the fact they can survive extreme drying, going into a type of hibernation state before being rehydrated.