As to disease, it is so rare in wild animals, or in a large majority of cases so quickly proves fatal, that, compared with what we call disease in our own species it is practically non-existent. The "struggle for existence," in so far as animals in a state of nature are concerned, is a metaphorical struggle; and the strife, short and sharp, which is so common in nature, is not misery, although it results in pain, since it is pain that kills or is soon outlived. Fear there is, just as in fine weather there are clouds in the sky; and just as the shadow of the cloud passes, so does fear pass from the wild creature when the object that excited it has vanished from sight. And when death comes, it comes unexpectedly, and is not the death that we know, even before we taste of it, thinking of it with apprehension all our lives long, but a sudden blow that takes away consciousness--the touch of something that numbs the nerves--merely the prick of a needle. In whatever way the animal perishes, whether by violence, or excessive cold, or decay, his death is a comparatively easy one. So long as he is fighting with or struggling to escape from an enemy, wounds are not felt as wounds, and scarcely hurt him--as we know from our own experience; and when overcome, if death be not practically instantaneous, as in the case of a small bird seized by a cat, the disabling grip or blow is itself a kind of anodyne, producing insensibility to pain. This, too, is a matter of human experience. To say nothing of those who fall in battle, men have often been struck down and fearfully lacerated by lions, tigers, jaguars, and other savage beasts; and after having been rescued by their companions, have recounted this strange thing. Even when there was no loss of consciousness, when they saw and knew that the animal was rending their flesh, they seemed not to feel it, and were, at the time, indifferent to the fate that had overtaken them. It is the same in death from cold. The strong, well-nourished man, overtaken by a snowstorm on some pathless, uninhabited waste, may experience some exceedingly bitter moments, or even hours, before he gives up the struggle. The physical pain is simply nothing: the whole bitterness is in the thought that he must die. The horror at the thought of annihilation, the remembrance of all the happiness he is now about to lose, of dear friends, of those whose lives will be dimmed with grief for his loss, of all his cherished dreams of the future--the sting of all this is so sharp that, compared with it, the creeping coldness in his blood is nothing more than a slight discomfort, and is scarcely felt. By and by he is overcome by drowsiness, and ceases to struggle; the torturing visions fade from his mind, and his only thought is to lie down and sleep. And when he sleeps he passes away; very easily, very painlessly, for the pain was of the mind, and was over long before death ensued.