Yet just as horses can cause paralyzing injuries, they can also help people learn to walk again through a form of physical rehabilitation called hippotherapy.
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In the wild, unshod hooves grow downwards approximately two-tenths of an inch per month. A wild horse’s natural daily activities, however, wear away the hoof at roughly the same rate, maintaining the proper balance between hoof wall and sole.
In this instance, nature is said to have “selected” the camouflaged butterfly over other variations that weren’t as well hidden. In “artificial selection,” the same thing happens, only we human beings make the choices.