The toughest creature on Earth has to be the Tardigrade.These eight-legged animals can withstand extreme temperatures as hot as 300 degrees Fahrenheit and as cold as 450 degrees below zero.
They can survive the crushing pressure of the deepest ocean and the airless vacuum of outer space.
They can even endure radiation exposure 100 times too deadly for humans.
Unfortunately for them though...
...they are only about one millimeter tall.