Based on the erotic manga by Arai Kei.

What are the most interesting animals?

This creature is nature’s toughest animal.
It can live in boiling water, solid ice, and the intense radiation of space.
It can survive a decade in a desert, without a drop of water to drink, or in the deepest trenches of the sea. Meet the tardigrade (Also known as water bear). (Pic:- A color-enhanced scanning electron micrograph of a tardigrade found in moss samples from Croatia in its active state; Credit:- Eye of Science/Science Source). Scientists estimate that tardigrades have been around for 600 million years (Note: Dinosaurs first appeared about 230 million years ago). Tardigrades can enter a state known as 'cryptobiosis' in which they are nearly impossible to kill.
It’s a form of suspended animation in which organisms can go on living even as they look dead. Tardigrades can withstand temperatures that would easily fry or freeze a human being.
Scientists have exposed them to heat over 300°F and cold below 1° Kelvin, or -458°F—a temperature at which most substances go bananas. In 2007, the European Space Agency even tested tuns in space, sending two species of tardigrades into low Earth orbit on the FOTON-M3 mission.
The tuns didn’t disappoint: tardigrades became the first animals to survive the one-two punch of solar radiation and space vacuum.
After returning to Earth it was discovered that a lot of the bears survived and some even had babies. When it comes to nuclear war they can survive as high as 5000 grays or approximately 500,000 rads of ionizing radiation.
Interestingly humans die around only 1000-2000 rads. Source: 5 Reasons Why The Tardigrade Is Nature’s Toughest Animal Tardigrades In Space (TARDIS) Water Bears on Ice: Guest blog by Jesamine Bartlett