To prevent the weaker members of the community from being preyed upon by innumerable vultures, it was needful that there should be an animal of prey … - John Stuart Mill

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To prevent the weaker members of the community from being preyed upon by innumerable vultures, it was needful that there should be an animal of prey stronger than the rest, commissioned to keep them down. But as the king of vultures would be no less bent upon preying upon the flock than any of the minor harpies, it was indispensable to be in a perpetual attitude of defense against his beak and claws.