These tree-climbing natives of the South and Central American rain forests live their lives like they’re on permanent vacation, creeping so slowly that some sloths actually grow moss on their backs. (Although they always look sleepy, sloths doze for only a reasonable 9.6 hours a day, according to a 2008 study.) Their diet – which consists of leaves, flowers, and bits of fruit – is to blame for their slow-motion lifestyle. After all, imagine how sluggish you’d be if all you ate were salad greens, and you had to climb to every room in your house.
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