Tardigrades ( Water Bears ) live in moss and ferns. They are some of the most amazing animals on Earth. They can survive:
Temperatures as low as -200 °C (-328 °F) and as high as 151 °C (304 °F);
Freezing in a block of ice,
Lack of oxygen,
Lack of water for as long as decade(s).
Levels of X-ray radiation 1000x the lethal human dose,
Most noxious chemicals,
Low pressure of a vacuum; like that of space,
And high pressure (up to 6x the pressure of the deepest part of the ocean).
They may be microscopic, but are very cool!