We can almost invariably tell whether the mother is likely to destroy the young one; and if from this or other causes a separation is necessary, a similar course is pursued, even when the mother is at large. If we had not effective means of driving off the rest of the herd, the difficulty of the operation of removal would be greatly increased, for, strange to say, as soon as the calf is born numbers of hippopotami assemble at certain distances and form a wide circle round the spot where the mother and little one are lying. They do not interfere with or annoy them in any way, but, on the contrary, they stand still, look at them, and utter wild, joyous sounds, as though they were pleased with the mother and the little visitor. In Montalluyah we call this "the hippopotamus's visit of congratulation." Before I describe the mode adopted when we wish to take one of the hippopotami from the herd, I should first premise that these beasts have the sense of hearing, acute to the highest degree, and could note even the fall of a pin. As, therefore, it is useless to try to approach them by stealth, the keepers approach them openly. These men are, however, clothed with a dress which covers every part of the body, head and extremities indeed even the face, with the exception of the eyes, but which is made of a very pliable material, so that the wearer has free use of his body and limbs. It is saturated with the antipathetic solution, of which I have spoken above. There is a three-cornered nut called the "lava-nut," of which the animals are very fond, and they will go a long distance in search of it. The keepers are provided with a quantity of these nuts, and the man with whom the animals are most familiar throws a few to the one selected. As soon as the animal has tasted them, he advances a few paces. The keeper, throwing more nuts, retires a few paces; and as he continues throwing, the animal advances, the keeper receding and throwing the nuts until he has attracted the beast for some distance from the herd. Near the keeper is a party of men furnished with a low caravan, who, while the animal is engaged eating the nuts, throw large nets over him. He struggles violently--it is, indeed, fearful to behold him; but, in the meanwhile, a very skilful man approaches, and throws over his head a cap or covering of a particular kind of wool, which for the time completely blinds him. So utterly is he cowed, that in a few minutes he is quite quiet, and it is surprising to see the difference that a simple contrivance has effected. The caravan immediately approaches with levers attached to it, by the aid of which the animal is easily put on the carriage and carried off to the place of his destination. It is surprising to see the immediate effect on the animal when the cap is taken off. He is for the time quite docile, and as easily managed as a child. An animal thus captured is never so wild and vicious as when with the herd, and often becomes comparatively tame.