From Today's New York Times

Animal Ethics

It is only the prejudice of our species that justifies culling the deer population while protecting our own. Seamus McGraw tells us he has to kill deer in his section of Pennsylvania because “with no predators to speak of—the wolves were wiped out centuries ago and the last mountain lion in the state was killed more than 70 years ago—the responsibility for trying to restore a part of that balance fell to me.” Who wiped out the wolves and mountain lions?