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 ...

Bauer, Erika B. and Hellmuth, Heidi. 2007. "Trying to reduce stereotypic pacing behavior in an adult male Sloth bear: a scientific approach with environmental enrichment." ABMA Wellspring, 8, (3) 8–13 ...