The giraffes herd together in small troops--consisting of ten or a dozen individuals--and prefer the open forests, or rather the hills covered with copses of acacia and other African trees. Their principal food is the foliage of these trees; and one species of mimosa--the _camel-doorn_ (camel-thorn) of the Dutch hunters--is their especial favourite. The leaves of this tree, like all others of the acacia tribe, are of pinnate form, and sweet to the taste; and the giraffe browses upon them, standing erect, with its long neck outstretched to a height of nearly twenty feet! Its tongue is possessed of a peculiarly prehensile power, and with this extended a foot or more beyond the lips, it can sweep in the leaves and twigs for a wide circle around its muzzle. When affrighted and put to its speed, the giraffe appears to go with an up-and-down gait, and some travellers have alleged that it limps. This arises from the fact, that every time it lifts its fore-feet, it throws back its long neck, which on other occasions is always held erect. It sometimes travels with a pacing step, but it can also gallop after the manner of a horse, and is even so swift that it requires a horse at full speed to overtake it. Notwithstanding that its food consists principally of the leaves and twigs of trees, the giraffe will also eat grass. While browsing thus, it usually bends one of its knees downward; and while stretching upwards to a high branch, it brings all its feet nearer to each other. It often lies down to "chew its cud" or to sleep; and this habit produces the callosities upon the sternum and knees, which resemble those of the camels. The giraffe is a peaceful and timid animal, and is often the prey of the lion--the fierce beast of prey taking it unawares, springing upon its back, and destroying it by breaking the cervical vertebrae with his powerful teeth. Sometimes, however, it is enabled to drive the lion off by kicking out against him with its heels, and tiring or discouraging him from the attack. The Hottentots and Kaffirs hunt the giraffe for the sake of its flesh, which in young individuals is very good eating. Sometimes, however, it smells strongly of a species of shrub upon which the animal feeds, and which gives it a disagreeable odour. The Bushmen are particularly fond of the marrow produced in its long shank bones, and to obtain this, they hunt the animal with their poisoned arrows. They also make out of its skin bottles and other vessels for containing water.