To Breathe Upside-Down, Sloths Tape Organs To Their Ribs

If you spent a lot of your life hanging upside-down, you’ve got a problem. Your liver, kidneys, stomach and other internal organs would press down upon your lungs and diaphragm, making it marginally harder to breathe. This won’t matter in the short term but in the long run, you’d spend a lot more energy on the simple act of inflating your lungs.

So, how do sloths cope? They live life in the slow lane, and they don’t have a lot of spare energy to play with. They also spend a lot of time hanging upside-down from branches. Cartoon drawings usually have them hanging horizontally, which isn’t a problem. But ...

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