The animal world can be divided into two types—specialists and opportunists. Specialists, like hawks or eagles, have one dominant skill upon which they depend for their survival. When they are not hunting, they can go into a mode of complete relaxation. Opportunists, on the other hand, have no particular specialty. They depend instead on their skill to sniff out any kind of opportunity in the environment and seize upon it. They are in states of constant tension and require continual stimulation. We humans are the ultimate opportunists in the animal world, the least specialized of all living
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