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But perhaps some persons may be disposed to employ an opposite train of argument, and to allege that the ancients were not only acquainted with as many large quadrupeds as we are, as has already been shewn, but that they have described several others which we do not now know,—that we act rashly in considering these animals as fabulous,—that we ought to search for them before concluding that we have exhausted the history of the present animal creation,—and, in fine, that among those animals which we presume to be fabulous, we may, perhaps, discover, when we become better acquainted with them, the originals of those bones of unknown animals which we discover buried in the earth. Some may even conceive, that those various monsters, which constitute the essential ornaments of the history of the heroic ages of almost all countries, are precisely those very species which it was necessary to destroy, in order to allow the establishment of civilization. Thus the Theseuses and Bellerophons of ancient times had been more fortunate than all the nations of our days, which have only been able to drive back the noxious animals, but have never yet succeeded in exterminating a single species.