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How Sloths Breathe Upside Down

Sloths are better adapted to hanging out than once thought. Researchers report in Biology Letters that sloths breathe easy by anchoring their internal organs to their rib cage, reducing the weight pressing on their lungs as they dangle upside down. The researchers believe this organ organization reduces a sloth’s energy expenditure by 7% to 13% when upside down, BBC News reports.

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