Why should he not? It stands the squirrel in hand to smell nuts; they are his life. He knows a false nut from a good one without biting into it. Try the experiment upon your tame chipmunk or caged gray squirrel, and see if this is not so. The false or dead nut is lighter, and most persons think this fact guides the squirrel. But this, it seems to me, implies an a.s.sociation of ideas beyond the reach of instinct. A young squirrel will reject a worthless nut as promptly as an old one will.
Again the sense of smell is the guide; the sound-meated nut has an odor which the other has not. All animals are keen and wise in relation to their food and to their natural enemies. A red squirrel will chip up green apples and pears for the seeds at the core: can he know, on general principles, that these fruits contain seeds? Does not some clue to them reach his senses?
I have known gray squirrels to go many hundred yards in winter across fields to a barn that contained grain in the sheaf. They could have had no other guide to the grain than the sense of smell. Watch a chipmunk or any squirrel near at hand: as a friend of mine observed, he seems to be smelling with his whole body; his abdomen fairly palpitates with the effort.
The c.o.o.n knows when the corn is in the milk, gaining that knowledge, no doubt, through his nose. At times he seems to know enough, too, to cut off his foot when caught in a trap, especially if the foot becomes frozen; but if you tell me he will treat his wound by smearing it with pitch or anything else, or in any way except by licking it, I shall discredit you. The practice of the art of healing by the application of external or foreign substances is a conception entirely beyond the capacity of any of the lower animals. If such a practice had been necessary for the continuance of the species, it would probably have been used. The knowledge it implies could not be inherited; it must needs come by experience. When a fowl eats gravel or sand, is it probable that the fowl knows what the practice is for, or has any notion at all about the matter? It has a craving for the gravel, that is all. Nature is wise for it.
The ostrich is described by those who know it intimately as the most stupid and witless of birds, and yet before leaving its eggs exposed to the hot African sun, the parent bird knows enough to put a large pinch of sand on the top of each of them, in order, it is said, to shade and protect the germ, which always rises to the highest point of the egg. This act certainly cannot be the result of knowledge, as we use the term; the young ostrich does it as well as the old. It is the inherited wisdom of the race, or instinct.
A sitting bird or fowl turns its eggs at regular intervals, which has the effect of keeping the yolk from sticking to the sh.e.l.l. Is this act the result of knowledge or of experience? It is again the result of that untaught knowledge called instinct. Some kinds of eggs hatch in two weeks, some in three, others in four. The mother bird has no knowledge of this period. It is not important that she should have. If the eggs are addled or sterile, she will often continue to sit beyond the normal period. If the continuance of the species depended upon her knowing the exact time required to hatch her eggs, as it depends upon her having the incubating fever, of course she would know exactly, and would never sit beyond the required period.
But what shall we say of Mrs. Annie Martin"s story, in her "Home Life on an Ostrich Farm," of the white-necked African crow that, in order to feast upon the eggs of the ostrich, carries a stone high in the air above them and breaks them by letting it fall? This looks like reason, a knowledge of the relation of cause and effect. Mrs. Martin says the crows break tortoise-sh.e.l.ls in the same way, and have I not heard of our own crows and gulls carrying clams and crabs into the air and dropping them upon the rocks?
If Mrs. Martin"s statements are literally true,--if she has not the failing, so common among women observers, of letting her feeling and her fancies color her observations,--then her story shows how the pressure of hunger will develop the wit of a crow.
But the story goes one step beyond my credence. It virtually makes the crow a tool-using animal, and Darwin knew of but two animals, the man-like ape and the elephant, that used anything like a tool or weapon to attain their ends. How could the crow gain the knowledge or the experience which this trick implies? What could induce it to make the first experiment of breaking an egg with a falling stone but an acquaintance with physical laws such as man alone possesses? The first step in this chain of causation it is easy to conceive of any animal taking; namely, the direct application of its own powers or weapons to the breaking of the sh.e.l.l. But the second step,--the making use of a foreign substance or object in the way described,--that is what staggers one.
Our own crow has great cunning, but it is only cunning. He is suspicious of everything that looks like design, that suggests a trap, even a harmless string stretched around a corn-field. As a natural philosopher he makes a poor show, and the egg or the sh.e.l.l that he cannot open with his own beak he leaves behind. Yet even his alleged method of dropping clams upon the rocks to break the sh.e.l.ls does not seem incredible. He might easily drop a clam by accident, and then, finding the sh.e.l.l broken, repeat the experiment. He is still only taking the first step in the sequence of causations.
A recent English nature-writer, on the whole, I think, a good observer and truthful reporter, Mr. Richard Kearton, tells of an osprey that did this incredible thing: to prevent its eggs from being harmed by an enforced exposure to the sun, the bird plunged into the lake, then rose, and shook its dripping plumage over the nest. The writer apparently reports this story at second-hand. It is incredible to me, because it implies a knowledge that the hawk could not possibly possess.
Such an emergency could hardly arise once in a lifetime to it or its forbears. Hence the act could not have been the result of inherited habit, or instinct, and as an original act on the part of the osprey it is not credible. The bird probably plunged into the lake for a fish, and then by accident shook itself above the eggs. In any case, the amount of water that would fall upon the eggs under such circ.u.mstances would be too slight to temper appreciably the heat.
There is little doubt that among certain of our common birds the male, during periods of excessive heat, has been known to shade the female with his outstretched wings, and the mother bird to shade her young in the same way. But this is a different matter. This emergency must have occurred for ages, and it, again, called only for the first step from cause to effect, and called for the use of no intermediate agent.
If the robin were to hold a leaf or a branch above his mate at such times, that would imply reflection.
It is said that elephants in India will besmear themselves with mud as a protection against insects, and that they will break branches from the trees and use them to brush away the flies. If this is true, it shows, I think, something beyond instinct in the elephant; it shows reflection.
All birds are secretive about their nests, and display great cunning in hiding them; but whether they know the value of adaptive material, such as moss, lichens, and dried gra.s.s, in helping to conceal them, admits of doubt, because they so often use the results of our own arts, as paper, rags, strings, tinsel, in such a reckless way. In a perfectly wild state they use natural material because it is the handiest and there is really no other. The phoebe uses the moss on or near the rocks where she builds; the sparrows, the bobolinks, and the meadowlarks use the dry gra.s.s of the bank or of the meadow bottom where the nest is placed.
The English writer to whom I have referred says that the wren builds the outside of its nest of old hay straws when placing it in the side of a rick, of green moss when it is situated in a mossy bank, and of dead leaves when in a hedge-row or a bramble-bush, in each case thus rendering the nest very difficult of detection because it harmonizes so perfectly with its surroundings, and the writer wonders if this harmony is the result of accident or of design. He is inclined to think that it is unpremeditated, as I myself do. The bird uses the material nearest to hand.
Another case, which this same writer gives at second-hand, of a bird recognizing the value of protective coloration, is not credible. A friend of his told him that he had once visited a colony of terns "on an island where the natural breeding accommodation was so limited that many of them had conveyed patches of pebbles on to the gra.s.s and laid their eggs thereon."
Here is the same difficulty we have encountered before--one more step of reasoning than the bird is capable of. As a deduction from observed facts, a bird, of course, knows nothing about protective coloring; its wisdom in this respect is the wisdom of Nature, and Nature in animal life never acts with this kind of foresight. A bird may exercise some choice about the background of its nest, but it will not make both nest and background.
Nature learns by endless experiment. Through a long and expensive process of natural selection she seems to have brought the color of certain animals and the color of their environment pretty close together, the better to hide the animals from their enemies and from their prey, as we are told; but the animals themselves do not know this, though they may act as if they did. Young terns and gulls instinctively squat upon the beach, where their colors so harmonize with the sand and pebbles that the birds are virtually invisible.
Young partridges do the same in the woods, where the eye cannot tell the reddish tuft of down from the dry leaves. How many gulls and terns and partridges were sacrificed before Nature learned this trick!
I regard the lower animals as incapable of taking the step from the fact to the principle. They have perceptions, but not conceptions.
They may recognize a certain fact, but any deduction from that fact to be applied to a different case, or to meet new conditions, is beyond them. Wolves and foxes soon learn to be afraid of poisoned meat: just what gives them the hint it would be hard to say, as the survivors could not know the poison"s deadly effect from experience; their fear of it probably comes from seeing their fellows suffer and die after eating it, or maybe through that mysterious means of communication between animals to which I have referred in a previous article. The poison probably changes the odor of the meat, and this strange smell would naturally put them on their guard.
We do not expect rats to succeed in putting a bell on the cat, but if they were capable of conceiving such a thing, that would establish their claim to be regarded as reasonable beings. I should as soon expect a fox or a wolf to make use of a trap to capture its prey as to make use of poison in any way. Why does not the fox take a stick and spring the trap he is so afraid of? Simply because the act would involve a mental process beyond him. He has not yet learned to use even the simplest implement to attain his end. Then he would probably be just as afraid of the trap after it was sprung as before. He in some way a.s.sociates it with his arch-enemy, man.
Such stories, too, as a chained fox or a coyote getting possession of corn or other grain and baiting the chickens with it--feigning sleep till the chicken gets within reach, and then seizing it--are of the same cla.s.s, incredible because transcending the inherited knowledge of those animals. I can believe that a fox might walk in a shallow creek to elude the hound, because he may inherit this kind of cunning, and in his own experience he may have come to a.s.sociate loss of scent with water. Animals stalk their prey, or lie in wait for it, instinctively, not from a process of calculation, as man does. If a fox would bait poultry with corn, why should he not, in his wild state, bait mice and squirrels with nuts and seeds? Has a cat ever been known to bait a rat with a piece of cheese?
Animals seem to have a certain a.s.sociation of ideas; one thing suggests another to them, as with us. This fact is made use of by animal-trainers. I can easily believe the story Charles St. John tells of the fox he saw waylaying some hares, and which, to screen himself the more completely from his quarry, sc.r.a.ped a small hollow in the ground and threw up the sand about it. But if St. John had said that the fox brought weeds or brush to make himself a blind, as the hunter often does, I should have discredited him, just as I discredit the observation of a man quoted by Romanes, who says that jackals, ambushing deer at the latter"s watering-place, deliberately wait till the deer have filled themselves with water, knowing that in that state they are more easily run down and captured!
President Roosevelt, in "The Wilderness Hunter,"--a book, by the way, of even deeper interest to the naturalist than to the sportsman,--says that the moose has to the hunter the "very provoking habit of making a half or three-quarters circle before lying down, and then crouching with its head so turned that it can surely perceive any pursuer who may follow its trail." This is the cunning of the moose developed through long generations of its hunted and wolf-pursued ancestors,--a cunning that does not differ from that of a man under the same circ.u.mstances, though, of course, it is not the result of the same process of reasoning.
I have known a chipping sparrow to build her nest on a grape-vine just beneath a bunch of small green grapes. Soon the bunch grew and lengthened and filled the nest, crowding out the bird. If the bird could have foreseen the danger, she would have shown something like human reason.
Birds that nest along streams, such as the water-thrush and the water-ouzel, I suppose are rarely ever brought to grief by high water.
They have learned through many generations to keep at a safe distance.
I have never known a woodp.e.c.k.e.r to drill its nesting-cavity in a branch or limb that was ready to fall. Not that woodp.e.c.k.e.rs look the branch or tree over with a view to its stability, but that they will cut into a tree only of a certain hardness; it is a family instinct.
Birds sometimes make the mistake of building their nests on slender branches that a summer tempest will turn over, thus causing the eggs or the young to spill upon the ground. Even instinct cannot always get ahead of the weather.
It is almost impossible for us not to interpret the lives of the lower animals in the terms of our own experience and our own psychology. I entirely agree with Lloyd Morgan that we err when we do so, when we attribute to them what we call sentiments or any of the emotions that spring from our moral and aesthetic natures,--the sentiments of justice, truth, beauty, altruism, goodness, duty, and the like,--because these sentiments are the products of concepts and ideas to which the brute natures are strangers. But all the emotions of our animal nature--fear, anger, curiosity, local attachment, jealousy, and rivalry--are undoubtedly the same in the lower orders.
Though almost anything may be affirmed of dogs, for they are nearly half human, yet I doubt if even dogs experience the feeling of shame or guilt or revenge that we so often ascribe to them. These feelings are all complex and have a deep root. When I was a youth, my father had a big churn-dog that appeared one morning with a small bullet-hole in his hip. Day after day the old dog treated his wound with his tongue, after the manner of dogs, until it healed, and the incident was nearly forgotten. One day a man was going by on horseback, when the old dog rushed out, sprang at the man, and came near pulling him from the horse. It turned out that this was the person who had shot the dog, and the dog recognized him.
This looks like revenge, and it would have been such in you or me, but in the dog it was probably simple anger at the sight of the man who had hurt him. The incident shows memory and the a.s.sociation of impressions, but the complex feeling of vengeance, as we know it, is another matter.
If animals do not share our higher intellectual nature, we have no warrant for attributing to them anything like our higher and more complex emotional nature. Musical strains seem to give them pain rather than pleasure, and it is quite evident that perfumes have no attraction for them.
The stories, which seem to be well authenticated, of sheep-killing dogs that have slipped their collars in the night and indulged their pa.s.sion for live mutton, and then returned and thrust their necks into their collars before their absence was discovered, do not, to my mind, prove that the dogs were trying to deceive their masters and conceal their guilt, but rather show how obedient to the chain and collar the dogs had become. They had long been subject to such control and discipline, and they returned to them again from the mere force of habit.
I do not believe even the dog to be capable of a sense of guilt. Such a sense implies a sense of duty, and this is a complex ethical sense that the animals do not experience. What the dog fears, and what makes him put on his look of guilt and shame, is his master"s anger. A harsh word or a severe look will make him a.s.sume the air of a culprit whether he is one or not, and, on the other hand, a kind word and a rea.s.suring smile will transform him into a happy beast, no matter if the blood of his victim is fresh upon him.
A dog is to be broken of a bad habit, if at all, not by an appeal to his conscience or to his sense of duty, for he has neither, but by an appeal to his susceptibility to pain.
Both Pliny and Plutarch tell the story of an elephant which, having been beaten by its trainer for its poor dancing, was afterward found all by itself practicing its steps by the light of the moon. This is just as credible as many of the animal stories one hears nowadays.
Many of the actions of the lower animals are as automatic as those of the tin rooster that serves as a weather-vane. See how intelligently the rooster acts, always pointing the direction of the wind without a moment"s hesitation. Or behold the vessel anch.o.r.ed in the harbor, how intelligently it adjusts itself to the winds and the tides! I have seen a log, caught in an eddy in a flooded stream, apparently make such struggles to escape that the thing became almost uncanny in its semblance to life. Man himself often obeys just such unseen currents of race or history when he thinks he is acting upon his own initiative.
When I was in Alaska, I saw precipices down which hundreds of horses had dashed themselves in their mad and desperate efforts to escape from the toil and suffering they underwent on the White Pa.s.s trail.
Shall we say these horses deliberately committed suicide? Suicide it certainly was in effect, but of course not in intention. What does or can a horse know about death, or about self-destruction? These animals were maddened by their hardships, and blindly plunged down the rocks.
The tendency to humanize the animals is more and more marked in all recent nature books that aim at popularity. A recent British book on animal life has a chapter ent.i.tled "Animal Materia Medica." The writer, to make out his case, is forced to treat as medicine the salt which the herbivorous animals eat, and the sand and gravel which grain and nut-eating birds take into their gizzards to act as millstones to grind their grist. He might as well treat their food as medicine and be done with it. So far as I know, animals have no remedies whatever for their ailments. Even savages have, for the most part, only "fake"
medicines.
A Frenchman has published a book, which has been translated into English, on the "Industries of Animals." Some of these Frenchmen could give points even to our "Modern School of Nature Study." It may be remembered that Michelet said the bird floated, and that it could puff itself up so that it was lighter than the air! Not a little contemporary natural science can beat the bird in this respect.
The serious student of nature can have no interest in belittling or in exaggerating the intelligence of animals. What he wants is the truth about them, and this he will not get from our natural history romancers, nor from the casual, untrained observers, who are sure to interpret the lives of the wood-folk in terms of their own motives and experiences, nor from Indians, trappers, or backwoodsmen, who give such free rein to their fancies and superst.i.tions.
Such a book as Romanes"s "Animal Intelligence" is not always a safe guide. It is like a lawyer"s plea to the jury for his client. Romanes was so intent upon making out his case that he allowed himself to be imposed upon by the tales of irresponsible observers. Many of his stories of the intelligence of birds and beasts are antecedently improbable. He evidently credits the story of the Bishop of Carlisle, who thinks he saw a jackdaw being tried by a jury of rooks for some misdemeanor. Jack made a speech and the jury cawed back at him, and after a time appeared to acquit Jack! What a child"s fancy to be put in a serious work on "Animal Intelligence"! The dead birds we now and then find hanging from the nest, or from the limb of a tree, with a string wound around their necks are no doubt criminals upon whom their fellows have inflicted capital punishment!
Most of the observations upon which Romanes bases his conclusions are like the incident which he quoted from Jesse, who tells of some swallows that in the spirit of revenge tore down a nest from which they had been ejected by the sparrows, in order to destroy the young of their enemies--a feat impossible for swallows to do. Jesse does not say he saw the swallows do it, but he "saw the young sparrows dead upon the ground amid the ruins of the nest," and of course the nest could get down in no other way!
Not to Romanes or Jesse or Michelet must we go for the truth about animals, but to the patient, honest Darwin, to such calm, keen, and philosophical investigators as Lloyd Morgan, and to the books of such sportsmen as Charles St. John, or to our own candid, trained, and many-sided Theodore Roosevelt,--men capable of disinterested observation with no theories about animals to uphold.
IX
DO ANIMALS THINK AND REFLECT?
When we see the animals going about, living their lives in many ways as we live ours, seeking their food, avoiding their enemies, building their nests, digging their holes, laying up stores, migrating, courting, playing, fighting, showing cunning, courage, fear, joy, anger, rivalry, grief, profiting by experience, following their leaders,--when we see all this, I say, what more natural than that we should ascribe to them powers akin to our own, and look upon them as thinking, reasoning, and reflecting. A hasty survey of animal life is sure to lead to this conclusion. An animal is not a clod, nor a block, nor a machine. It is alive and self-directing, it has some sort of psychic life, yet the more I study the subject, the more I am persuaded that with the probable exception of the dog on occasions, and of the apes, animals do not think or reflect in any proper sense of those words. As I have before said, animal life shows in an active and free state that kind of intelligence that pervades and governs the whole organic world,--intelligence that takes no thought of itself.