Man, however, was enabled to resist the attacks of revolted nature. Without doubt, in this unhappy period, he must have made but little progress, even if his intellectual development were not completely stopped. At all events, the human species did not perish. The glacial period came to an end, the ice-fields shrank back to their original limits, and Nature reassumed its primitive aspect. When the ice had gradually retired into the more northern latitudes, and had become confined to the higher summits, a new generation of animals--another _fauna_, as naturalists call it--made its appearance on the globe. This group of animals, which had newly come into being, differed much from those that had disappeared in the glacial cataclysm. Let us cast an inquiring glance on these strange and now extinct creatures. First we have the mammoth (_Elephas primigenius_), or the woolly-haired and maned elephant, carcases of which were found, entire and in good preservation, in the ice on the coasts of Siberia. Next comes the rhinoceros with a complete nasal septum (_Rhinoceros tichorhinus_), likewise clad in a warm and soft fur, the nose of which is surmounted with a remarkable pair of horns. Then follow several species of the hippopotamus, which come as far north as the rivers of England and Russia; a bear of great size inhabiting caverns (_Ursus spelæus_), and presenting a projecting forehead and a large-sized skull; the cave lion or tiger (_Felis spelæa_), which much surpassed in strength the same animals of the existing species; various kinds of hyænas (_Hyæna spelæa_), much stronger than those of our epoch; the bison or aurochs (_Biso europæus_), which still exists in Poland; the great ox, the Urus of the ancients (_Bos primigenius_); the gigantic Irish elk (_Megaceros hibernicus_), the horns of which attained to surprising dimensions. Other animals made their appearance at the same epoch, but they are too numerous to mention; among them were some of the Rodent family. Almost all these species are now extinct, but man certainly existed in the midst of them. The mammoth, elephant, rhinoceros, stag, and hippopotamus were then in the habit of roaming over Europe in immense herds, just as some of these animals still do in the interior of Africa. These animals must have had their favourite haunts--spots where they assembled together in thousands; or else it would be difficult to account for the countless numbers of bones which are found accumulated at the same spot. Before these formidable bands, man could dream of nothing but flight. It was only with some isolated animal that he could dare to engage in a more or less unequal conflict. Farther on in our work, we shall see how he began to fabricate some rough weapons, with a view of attacking his mighty enemies.