In the foremost rank of the great animals to which the fauna of Asia and Africa owes its superiority, I have named the huge Pachyderms,[123] those mighty colossi which may be regarded as the analogues, in the terrestrial creation, of the Cetacean giants of the marine creation. The Pachyderms formed in Cuvier's system a sufficiently natural order, which modern systematists have dismembered, and, as I believe, a little arbitrarily. This order comprised, besides the elephants, the hippopotami, the rhinoceroses, and the tapirs, all the Porcidæ family, and even the Solidungulates, such as the horse and ass. In the present work I shall adopt Cuvier's division. The elephant is the denizen of the forests where, in a succeeding chapter, we shall encounter both him and the rhinoceros. But the hippopotamus belongs incontestably to the fauna of the plain. His name (from the Greek) signifies "River Horse." And, indeed, he lives in the rivers, the pools, the deep marshes; his manners are essentially amphibious. He dives and swims with a surprising ease and agility, considering the enormous bulk of his body, and the shortness of his heavy, unwieldy legs. He is able to remain a long time under water. His colour is a brownish-black, and his proportions, ten to twelve feet in length, and eight to ten in height. His head is immensely large; the mouth cavernous in its prodigious width; the teeth immensely strong, the incisors and canines of the lower jaw being long, and curved forwards; these canines or tusks sometimes measure more than two feet in length, and weigh upwards of six pounds each. Those in the upper jaw are much smaller, and the front teeth are of a moderate size. The broad thick lips are beset with scattered tufts of short bristles; the small quick eyes are placed very near the top of the head; the small ears are slightly pointed, and lined with short thick hair. His food mainly consists of the coarse herbage that flourishes on the banks of lakes and rivers; but Milne Edwards speaks of three or four of them standing knee-deep in the water, forming an irregular line, and pouncing upon the fish brought within their reach by the rapid currents. At night time they abandon their watery haunts to prowl among the sugar-cane plantations, the fields of millet and rice, which they devour with eagerness. Their march is so impetuous, that they break down every barrier; nothing can resist them.