The Olm or proteus is a type of aquatic salamander that loves to hide in underwater caves across Europe. These little salamanders predictably live for decades, reaching 100 years of life.
However, most Olms in the wild tend to live only till 65 to 80 years. The oldest recorded Olm was 102 years old.
While it is an amphibian, its behavior and life is vastly different from others. It dwells, eats, sleeps, and breeds underwater as well, being entirely aquatic in nature.
Olms have a longer life expectancy than any other amphibian in the world.