Tardigrades can withstand temperatures from just above absolute zero to well above the boiling point of water. They can survive pressures greater than any found in the deepest ocean trenches and have lived through the vacuum of outer space. They can survive solar radiation, gamma radiation, ionic radiation— at doses hundreds of times higher than would kill a person. They can go without food or water for nearly 10 years, drying out to the point where they are 3% or less water, only to rehydrate, forage, and reproduce。
http://en.wikipedia.org/wiki/Tardigrade
蟑螂能够在栖息地遭受核打击后幸存下来，生命力之强悍令人叹为观止。实际上，地球上生活着比蟑螂更为强悍的动物，那就是被称之为“自然界最伟大幸存者”的水熊虫。
水熊虫能够经受住零下457华氏度的低温，零上357度的高温以及5700戈瑞辐射考验，10到20戈瑞的辐射剂量便足以杀死人类以及其他绝大多数动物。此外，它们还能在无水情况下存活10年，甚至能够在太空中幸存下来。
即使将它们蒸煮、冰冷、暴晒或者置于高辐射的环境，水熊虫仍能存活200年之久。
从海拔最高的山脉到深度最深的海洋，水熊虫的足迹遍布地球的每一个角落。
