Horses have a small bone just below their front knees called the third metacarpal, or shin bone, which supports their whole weight even when galloping. Only about the thickness of a human wrist, the bone must endure a lot of stress without fracturing. To make matters worse, a pea-sized hole, called a foramen, cuts through the small bone to make room for blood vessels. In manmade structures, similar holes are a frequent source of weakness and failure. So at first glance, horse legs appear to be poorly designed.
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