Covenant of the Wild: Why Animals Chose Domestication | 
The tracks of wild animals such as wolves and foxes move in straight and purposeful lines; at the trot, each hind foot is cautiously placed exactly in the spot where the corresponding front foot first fell. Dog and cat tracks are a testimony to carefree fearlessness. They meander, circle, zigzag, and drag; the hind feet sloppily miss the mark. (34)
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