Sloths—the sluggish tree-dwellers of Central and South America—spend
their lives in the tropical rain forests. They move through the canopy
at a rate of about 40 yards per day, munching on leaves, twigs and buds.
Sloths have an exceptionally low metabolic rate and spend 15 to 20 hours
per day sleeping. And surprisingly enough, the long-armed animals are
excellent swimmers. They occasionally drop from their treetop perches
into water for a paddle.
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