Among the greatest mysteries of the tropical rainforest are the pooping habits of sloths. Really. Those furry, slow-moving tree dwellers almost never descend from the safety of the tree tops—except ...

Their four-part stomach takes its time to extract nutrients from fibrous leaves, which helps stretch out energy in an otherwise low-calorie diet. Two-Toed and Three-Toed Sloths Aren’t That Closely ...

For years scientists assumed that sloths don't fart — believing the methane produced by their slow digestive system was simply absorbed into their bloodstreams and breathed out through their mouths.