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Message Subject Energetic Sites
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Why Birds Can Sleep on Branches and Not Fall Off
Their talons work through a series of pulleys made of tendons, as these GIFs and drawing explain.

You ever see a bird clutching onto a branch high in a tree and wonder, "What happens if it falls asleep? How could it hold on?"

The avian talon works through a "pulley system of tendons," according to the animal morphology blog Ars Anatomica, and it can lock into place.
 
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