It’s not the muscles but the tendons, the tendons are shaped so the hand stays closed. Even humans don’t naturally hold their hands flat, if you relax you hand it goes into the claw shape you often see paraplegics hold their hands in because they can’t control the muscles in Official Sloth Camping Team We Will Get There When We Get There Vintage Shirt their hands. However. It’s not reversing anything. Your hand isn’t completely open naturally (hold your hand without any muscles. Your fingers are slightly curled). You have to exert muscles in order to force your hand completely open. Slots by default have a fully closed hand. So they are just doing what you do you flatten your palms.
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You should check out how an eagle’s grip works. Their tendons and Official Sloth Camping Team We Will Get There When We Get There Vintage Shirt tendon sheaths have evolved in such a way that they are like a ratcheting vice grip. Once a level of gripping force is achieved, minimal muscle exertion is required to maintain the same level of pressure. Trains are probably closer to airplanes then security systems though if I had to guess.
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But not idiotproof. Young sloths sometimes fall out of Official Sloth Camping Team We Will Get There When We Get There Vintage Shirt trees because they let go of the branch with their left hand, grasp their right arm with their left hand, then let go of the branch with their right hand. Oops. FWIW the Sloth Conservation Foundation (almost wrote Sloth Conversation Foundation there, which would have been far too apt for this world) says that sloths fall out of their tree about once a week on average, but doesn’t go into the reasons.