Tardigrades: The only animal that survives in Vacuum of Space

Tardigrades are tiny water dwelling animals.

They're also complete badasses.

They are to date the only animals known to be able to survive in the vacuum of space. They can also survive doses of ionizing radiation that would kill a human, go without food or water for ten years and survive temperatures almost down to absolute zero. They can also completely dry out, to the point where they're just 3% water, and then rehydrate and happily carry on their life cycle.

Image by Andreas Schmidt-Rhaesa, Corinna Schulze and Ricardo Neves for the Nikon Small World competition.