The woolly mammoth now reaches the height of its evolution and specialization; as preserved in the frozen tundras of northern Siberia, and as represented in very numerous drawings and engravings by the Upper Palæolithic artists, it is the most completely known of all fossil mammalia.(22) Its proportions, as shown in the accompanying figure, which represents the information gathered from all sources, are entirely different from those of either the Indian or African elephant. The head is very high and surmounted by a great mass of hair and wool; behind this a sharp depression separates the back of the head from the great hump on the back; the hinder portion of the back falls away very rapidly and the tail is short; the overcoat of long hair nearly reaches the ground, and beneath this is a warm undercoating of wool. It is not improbable that the humps on the head and the back were fat reservoirs. The color of the hair was a yellowish brown, varying from light brown to pure brown; woolly hair, from an inch to an inch and a half in length, covered the whole body interspersed with the shorter hairs was a large number of longer and thicker hairs, which formed mane-like patches on the cheeks, chin, shoulders, flanks, and abdomen. A broad fringe of this long hair extended along the sides of the body, as depicted in the work of the Upper Palæolithic artists in the Combarelles Cave. Especially interesting to us is the food found in the stomach and mouth of the frozen Siberian mammoths, which consists chiefly of a meadow flora such as flourishes during the summer in northern Siberia at the present day, including grasses and sedges, wild thyme, beans of the wild oxytropis, also the arctic variety of the upright crowfoot (_Ranunculus acer_). This was the summer food. The winter food undoubtedly included the leaves and stems of the willow, the juniper, and other winter plants. [Illustration: FIG. 102. The woolly mammoth (_Elephas primigenius_) and the contemporary Neanderthal hunters (_Homo neanderthalensis_), after the drawings of Upper Palæolithic artists and the frozen mammoths found in northern Siberia. By Charles R. Knight, 1915.]