Add Yahoo as a preferred source to see more of our stories on Google. Three-toed sloth mating calls are often described as high-pitched screams or shrill whistles. These calls travel long distances ...

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 ...

Sloths are some pretty interesting animals. Beyond their reputation for being slow, a host of different traits reveals a lot about their evolution and behaviors. Take for example their mating calls.