Water bears. It can survive under the conditions of - and -, can survive for several days under low temperature, and can at least survive in the environment of -.
The water bear is also known as the water bear, and is nicknamed "Xiaomei", which is a common name for Tardigrata. There are about species recorded, many of which are distributed worldwide.
The size of the water bear is very small, the smallest is only meters, and the largest is meters. It can only be seen clearly with a microscope. The surface of the body is covered with a layer of water film, which is used to avoid dryness of the body and can breathe oxygen in the water film.
Water bears are known to have the strongest vitality on the earth. They can live in outer space without protective measures. They can live in the Himalayas (above, found here), hot springs, Antarctica and deep sea (below).