Another small specimen which I saw at Gaboon was not of much interest except from one fact, and that was it was broken out with an eruptive disease prevalent among the natives. This disease is called craw-craw, or kra-kra. It is said to originate from the water, either by external or internal use of that fluid. This animal was infected in the same way and on the same parts of the body as men are affected by the same disease, and is another instance of apes being subject to the same maladies as those of man. The specimen itself also exemplified the difference in intellect among these animals, for this one had in its face a look of mental weakness, and every act confirmed the fact. It was silent, inactive, and obtuse.
During my residence in the cage I saw fewer chimpanzees than gorillas; but from those I did see it was an easy matter to determine that they are much less shy and timid than the gorillas.
On one occasion I heard a chimpanzee in the bush not far away from the cage. I called him with the usual sound. He answered, but did not come to the cage. It is probable that he could see it and was afraid of it. I tried to induce Moses to call him, and he did once utter the sound; but he appeared to regret having made the attempt. I called again and the stranger answered, and from the manner in which Moses behaved it was evident that the call had been understood. Moses would not attempt the call again, but clung to my neck with his face buried under my chin. It was probably jealousy that caused him to refuse, because he did not want the other to share my attentions. I gave the food sound, but I could not induce the visitor to come nearer. I failed to get a view of him so as to tell how large he was, but from his voice I judged that he must have been about full-grown. Whether he was quite alone or not I was not able to tell; but only the one voice could be heard.
Another time while I was sitting quite alone, a young chimpanzee, perhaps five or six years old, appeared at the edge of a small opening of the bush. He plucked a bud or leaf from a small plant. He raised it to his nose and smelt it. He picked three or four buds of different kinds, one or two of which he put in his mouth. He turned aside the dead leaves that were lying on the ground, as if he expected to find something under them. I spoke to him, using the call sound; he instantly turned his eyes towards me, but made no reply. I uttered the food sound, and he replied but did not move. He betrayed no sign of fear and but little of surprise. He surveyed the cage and myself. I repeated the sound two or three times. He refused to approach any nearer. He turned his head from side to side for a moment, as if in doubt which way to go; then he turned aside and disappeared in the bush. He did not run or start away as if in great fear, but by the sound of the shaking bushes it could be told that he increased his speed after he had once disappeared from view.
One day I had been for a stroll with Moses and the boy. As we returned to the cage we saw a chimpanzee about half grown; he was crossing a rugged little path about thirty yards away from us. He paused for a moment to look at us, and we stopped. I tried to induce Moses to call out to him, but he declined to do so. As the stranger turned aside I called to him myself, but he neither stopped nor answered. This one appeared to be quite brown, but the boy assured me the hair was jet black, and that the light skin gave the appearance of brown color. To satisfy myself, I had Moses placed in the same attitude and position, and, looking at him from the same distance, I became convinced that the boy was right.
One morning, having started with Moses for a walk, we had gone only some forty yards away from the cage when he made a sound of warning. I instantly looked up and saw a large chimpanzee standing in the bush not more than twenty yards away. I paused to observe him. He stood for a moment, looking straight at us. I spoke to him, but he made no reply; he moved off in a line almost parallel to the little path we were in, and I returned towards the cage. He did not come any nearer to us, but kept his course almost parallel with ours. From time to time he turned his head to look, but gave no sign of attack. I called to him several times, but he made no answer. When I had reached a place in front of the cage I called again, and after the lapse of a few seconds he stopped. By this time he was concealed from view. He halted only for a moment, changed his course, and resumed his journey. This was the largest chimpanzee I saw in the forest. Once, while sitting in the cage, I heard the sound of something making its way through the bush not more than twenty yards away; presently a chimpanzee came into view. As it crossed the path near by, I called three or four times, but it neither stopped nor answered. As well as I could tell, it appeared to be a female and quite grown.
I may take occasion to remark that, while the chimpanzee is mostly found in large family groups,—as I have reason to believe, from native accounts of them and from what has been told me by white men,—I have never been able to see a family of them together. Each of these that I have mentioned, so far as I could tell, was quite alone. Whether or not the others were scattered through the forest in like manner, hunting for food, and all came together after this, I cannot say.
Another thing worthy of mention is the fact that both these apes, the chimpanzee and the gorilla, live in the same forest, and twice on the same day I have seen both kinds. This is contrary to the common idea that they do not inhabit the same jungle. It appears that where there is a great number of the one kind there are but a few of the other. The natives say that in combat between the chimpanzee and the gorilla the former is always victor, and on this account the gorilla fears the chimpanzee. I believe this to be true, because the chimpanzee, although not so strong as the gorilla, is more active and more intelligent.
The chimpanzee will not approach or attack man if he can avoid him, but he does not shrink from him as the gorilla does. One instance that will illustrate this phase of his character I shall relate. On one occasion recently, while I was on the coast, a native boy started across a small plain near the trading station. With him was a dog that belonged to the white trader of the place. The dog was in advance of the boy, and as the latter emerged from a small clump of the bush he heard the dog bark in a playful manner, and discovered him not more than thirty yards away, prancing, jumping, and barking in a jolly way with a chimpanzee which appeared to be five or six years old. The ape was standing in the path along which the boy was proceeding. He was slapping at the dog with his hands and did not seem to relish the sport; yet he was not resenting it in anger. The dog thought the ape was playing with him, and he was taking the whole thing in fun. The boy looked at them for a few moments and retreated. As soon as he disappeared the dog desisted and followed him to the house. The boy was afraid of the ape and made no attempt to capture him. The ape was taken by surprise by the dog and the boy, and thus had no time to escape. He did not strike to harm the dog, but only to ward him off. The dog made no attempt to bite the ape, but would jump up against him and knock him out of balance, and this annoyed him. The ape didn’t seem to understand just what the dog meant.
I shall not describe those apes that have been kept in captivity and are well known; but I will mention some of them. The largest specimen of the chimpanzee that I have ever seen was Chico, who belonged to Mr. James A. Bailey of New York. He was as large perhaps as these apes ever become, although he was less than ten years old when he died.