The Rhinoceros is found in both Asia and Africa, and is classified by Dr. Gray in four genera. Of these the Indian Rhinoceros, the Rhinoceros of Sumatra, and the Mahoohoo of South and Central Africa are representatives. Mr. Gordon Cumming says, "There are four varieties in South Africa, distinguished by the Bechuanas by the names of the Borèlé or black rhinoceros, the Keitloa or two-horned black rhinoceros, the Muchocho or common white rhinoceros and the Kobaoba or long-horned white rhinoceros. Both varieties of the black rhinoceros are extremely fierce and dangerous, and rush headlong and unprovoked upon any object which attracts their attention. Their horns are much shorter than those of the other varieties, seldom exceeding eighteen inches in length. They are finely polished with constant rubbing against trees. The skull is remarkably formed, its most striking feature being the tremendous thick ossification in which it ends above the nostrils. It is on this mass that the horn is supported. The horns are not connected with the skull, being attached merely by the skin, and they may thus be separated from the head by a sharp knife. They are hard and perfectly solid throughout. The eyes of the rhinoceros are small and sparkling and do not readily observe the hunter, provided he keep to leeward of them. The skin is extremely thick, and only to be penetrated by bullets hardened with solder." "During the day the rhinoceros will be found lying asleep or standing indolently in some retired part of the forest, or under the base of the mountains, sheltered from the power of the sun by some friendly grove of umbrella-topped mimosas. In the evening they commence their nightly ramble, and wander over a great extent of country." "The black rhinoceros is subject to paroxysms of unprovoked fury, often ploughing up the ground for several yards with its horns, and assaulting large bushes in the most violent manner." "The rhinoceros is supposed by many, and by myself among the rest, to be the animal alluded to by Job, Chap. XXXIX, verses 10 and 11, where it is written: 'Canst thou bind the unicorn with his band in the furrow? or will he harrow the valleys after thee? Wilt thou trust him because his strength is great? or wilt thou leave thy labour to him?'" "All the four varieties delight to roll and wallow in mud, with which their rugged hides are generally encrusted. Both varieties of the black rhinoceros are much smaller and more active than the white, and are so swift that a horse with a rider on his back can rarely overtake them. The two varieties of the white rhinoceros are so similar in habits, that the description of one will serve for both; the principal difference consisting in the length and set of the anterior horn; that of the muchocho averaging from two to three feet in length, and pointing backwards; while the horn of the Kobaoba often exceeds four feet in length, and inclines forward from the nose at an angle of 45°. The posterior horn of either species seldom exceeds six or seven inches in length. Both these varieties attain an enormous size, being the animals next in magnitude to the elephant. They feed solely on grass, carry much fat, and their flesh is excellent, being preferable to beef."