Famously unhurried, the three-toed sloth averages a mere 0.15 mph (0.24 km/h), spending most of its life hanging upside down in trees. This leisurely lifestyle is an energy-saving adaptation, and their fur even hosts a unique ecosystem of algae and moths, providing camouflage. They only descend to the ground about once a week to defecate—a surprisingly risky ritual!
