with man through countless generations has taught domestic animals not only the fact of their safety when giving voice, but also that very often there is great virtue in a vigorous outcry. With an insistent staccato neigh, the hungry horse jars the dull brain of its laggard master, and prompts him to "feed and water the stock." But how different is the cry of a lost horse, which calls for rescue. It cannot be imitated in printed words; but every plainsman knows the shrill and prolonged trumpet-call of distress that can be heard a mile or more, understandingly.
And think of the vocabulary of the domestic chicken! Years of life in fancied security have developed a highly useful vocabulary of language calls and cries. The most important, and the best known, are the following:
"Beware the hawk!"—"Coor! Coor!" "Murder! Help!"—"Kee- owk! Kee-owk! Kee-owk!" "Come on"—"Cluck! Cluck! Cluck!" "Food here! Food!"—"Cook-cook-cook-cook!" Announcement, or alarm—"Cut-cut-cut-dah-cut!" But does the wild jungle-fowl, the ancestor of our domestic chicken, indulge in all those noisy expressions of thought and feeling? By no means. I have lived for months in jungles where my hut was surrounded by jungle-fowl, and shot many of them for my table; but the only vocal sound I ever heard from their small throats was the absurdly shrill bantam-like crow of the cock. And even that led to several fatalities in the ranks of Gallus stanleyi.
Domestic cattle, swine and fowls have each a language of their own, and as far as they go they are almost as clear-cut and understandable as the talk of human beings. Just how much more is behind the veil that limits our understanding we cannot say; but no doubt there is a great deal.
But it is with the language of wild animals that we are most concerned. As already pointed out, wild creatures, other than song-birds, do not care to say much, because of the danger of attracting enemies that will exterminate them. Herein lies the extreme difficulty of ascertaining how wild beasts communicate. In the Animallai Hills of southern India I hunted constantly for many weeks through forests actually teeming with big game. There were herds upon herds of elephants, gaur, axis deer, sambar deer, monkeys by the hundred, and a good sprinkling of bears, wild hogs and tigers.
We saw hundreds upon hundreds of animals; but with the exception of the big black monkeys that used to swear at us, I can almost count upon my fingers the whole number of times that we heard animals raise their voices to communicate with each other.
Ape Voices. Naturally it is of interest to know something of the voices of the animals that physically and mentally stand nearest to man.
The wild gorilla has a voice almost equal to that of the chimpanzee, but in captivity he rarely utters any vocal sound other than a shriek, or scream.
The baby orang-utan either whines or shrieks like a human child. The half-grown or adult orang when profoundly excited bellows or roars, in a deep bass voice. Usually, however, it is a persistently silent animal.
The chimpanzee has a voice, and vociferously expresses its emotions.
First and most often is the plaintive, coaxing note, "Who'-oo! who'-oo! who'-oo!"
Then comes the angry and threatening, "Wah', wah', wah-! Wah'-hool Wah'-hool"
Lastly we hear the fearful, high-pitched yell or shriek, "Ah-h-h- h!" or "E-e-e-e."
The shriek, or scream, can be heard half a mile, and at close range it is literally ear-splitting. Usually it is accompanied by violent stamping or pounding with the feet upon the floor. It may signify rage, or nothing more than the joy of living, and of having a place in which to yell. It is this cry that is uncannily human-like in sound, and when heard for the first time it seems to register anguish.
In its Bornean jungle home, the orang-utan is nearly as silent as the grave. Never save once did I hear one utter a vocal sound. That was a deep bass roar emitted by an old male that I disturbed while he was sleeping on the comfortable nest of green branches that he had built for himself.
Concerning the chimpanzee, the late Mr. Richard L. Garner testified as follows:
"Not only does the chimpanzee often break the silence of the forest when all other voices are hushed, but he frequently answers the sounds of other animals, as if in mockery or defiance. … Although diurnal in habit, the chimpanzees often make the night reverberate with the sounds of their terrific screaming, which I have known them to continue at times for more than an hour, with scarcely a moment's pause,—not one voice but many, and within the area of a square mile or so I have distinguished as many as seven alternating adult male voices.
"The gorilla is more silent and stoical than the chimpanzee, but he is far from being mute. He appears to be devoid of all risibility, but he is often very noisy. Although diurnal in habit, he talks less frequently during the day than at night, but his silence is a natural consequence of his stealth and cunning. There are times, however, when he ignores all danger of betraying his whereabouts or his movements, and gives vent to a deluge of speech. At night his screams and shouts are terrific."
The gibbons (including the siamang) have tremendous voices, with numerous variations, and they love to use them. My acquaintance with them began in Borneo, in the dense and dark coastal forest that there forms their home. I remember their cries as vividly as if I had heard them again this morning. While feeding, or quietly enjoying the morning sun, the gray gibbon (Hylobates concolor) emits in leisurely succession a low staccato, whistle-like cry, like "Hoot! Hoot! Hoot!" which one can easily counterfeit by whistling. This is varied by another whistle cry of three notes, thus: "Who-ee-hoo! Who-ee-hoo!" also to be duplicated by whistling. In hunting for specimens of that gibbon, for American museums, I could rarely locate a troop save by the tree- top talk of its members.
But all this was only childish prattle in comparison with the daily performances of the big white-handed, and the black hoolock gibbons, now and for several years past residing in our Primate House. Every morning, and perhaps a dozen times during the day, those three gibbons go on a vocal rampage and utter prolonged and ear-splitting cries and shrieks that make the welkin ring. The shrieking chorus is usually prolonged until it becomes tiresome to the monkeys. In all our ape and monkey experience we never have known its equal save in the vocal performances of Boma, our big adult male chimpanzee, the husband of Suzette.
A baboon emits occasionally, and without any warning, a fearful explosive bark, or roar, that to visitors is as startling as the report of a gun. The commonest expressions are "Wah!" and "Wah'-hoo!", and the visitor who can hear it close at hand without jumping has good nerves.
The big and solemn long-nosed monkey of Borneo (Nasalis larvatus) utters in his native tree-top (overhanging water), a cry like the resonant "honk" of a saxophone. He says plainly, "Kee honk," and all that I could make of its meaning was that it is used as the equivalent of "All's well."
Of all the monkeys that I have ever known, either wild or in captivity, the red howlers of the Orinoco, in Venezuela, have the most remarkable voices, and make the most remarkable use of them. The hyoid cartilage is expanded,—for Nature's own particular reasons,—into a wonderful sound-box, as big as an English walnut, which gives to the adult voice a depth of pitch and a booming resonance that is impossible to describe. The note produced is a prolonged bass roar, in alternately rising and falling cadence, and in reality comprising about three notes. It is the habit of troops of red howlers to indulge in nocturnal concerts, wherein four, five or six old males will pipe up and begin to howl in unison. The great volume of uncanny sound thus produced goes rolling through the still forest, far and wide; and to the white explorer who lies in his grass hammock in pitchy darkness, fighting off the mosquitoes and loneliness, and wondering from whence tomorrow's meals will come, the moral effect is gruesome and depressing.
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