Sloths are the slowest mammal on the planet. But as strange as they seem the sloth is perfectly adapted to their environment and is actually slow for a very important reason. In fact, sloths are far from boring and are a lot more extreme than it seems. With an ecosystem on their backs, which scientists believe may even be capable of curing cancer. They even risk their lives to poop and when they do, they make it count, pooping over 30% of their body weight.