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- How Sloths Hang Upside Down Without Getting Tired
But unlike humans, these creatures don't have trouble breathing in that inverted position, because their internal organs are fixed in place, new research finds. Three-toed sloths (Bradypus variegatus) have special "adhesions" that anchor their guts to their lower ribs, preventing their organs from pressing down on their lungs, scientists say.
April 28, 2014 - LiveScience.com via Yahoo! News