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Originally Posted by SilverTab
Horses can literally "lock" their legs...it requires no effort...
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Birds have an equal ligament locking system in their legs AND toes. That's how they sleep in trees on windy nights.
As for humans, I've slept many a night standing up in Nam. And in the rain. It's not an impossible thing to do. With out the "locking systems" of other types, we have to depend on "locking" our frame against a stable object, like a tree or wall corner.