MAMMALIA. 331 
Even-toed Ungulates (Artiodactyla). Hippopota- 
mus (Hippopotamide), two species.—These huge creatures 
inhabit many of the great rivers of Africa. The body is 
extremely large, the legs short, the feet having four toes, 
each one being hoofed. The head is large, and the gape 
enormous. The teeth are of large size, and often number 
forty, and are used in cutting the bark from trees, which 
forms a prominent feature of their food. They are noc- 
turnal animals, and are aquatic in their habits. They 
formerly lived as far north as England. 
VALUE.—Hide, and ivory from the teeth. 
Swine (Suidz).—The swine are characterized by four 
toes upon each foot, the anterior digits being furnished 
with strong hoofs. The head is pointed, the snout blunt, 
terminating in an 
organ adapted for 
rooting, the ears 
large, and theskin 
covered with bris- 
tles. The com- 
mon hog is a de- 
scendant of the 
wild boar, an in- 
habitant of the 
forests of Europe y 
and Asia. The FIG. 355.—Babiroussa. 
latter is extreme- 
ly fierce. The masked boar of southeastern Africa, the 
Babiroussa, an inhabitant of the islands of the Indian 
Archipelago (Fig. 355), and the wart-hog, are allies. The 
peccaries (Dicotyles) are American representatives of the 
family, inhabiting Mexico and South America. 
. 
VALUE.—Flesh, hide, hair, hoofs, etc. 
Deer (Cervide).—These and the following hoofed ani- 
mals are generally called ruminants, from the fact that the 
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