Herd instinct

“ The appearance of the fourth instinct, however, introduces a profound change, for this instinct has the characteristic that it exercises a controlling power upon the individual from without. In the case of the solitary animal yielding to instinct the act itself is pleasant, and the whole creature, as it were body and soul, pours itself out in one smooth concurrence of reaction. With the social animal controlled by herd instinct it is not the actual deed which is instinctively done, but the order to do it which is instinctively obeyed. ”

“ A scientific friend, the most observant ornithologist I have ever met, has just offered an interesting explanation of the flock or herd phenomena we are here considering. He finds little evidence of a swarm instinct, as distinct from our familiar social instinct; but he has often marveled at the wing drill of birds, and has twice witnessed an alarm or warning of danger spread silently among a herd of scattered beasts ”

“ We may readily imagine that the instinct displayed by many herbivorous animals of goring sick and wounded companions, is really of use in countries where the presence of weak members in a herd is a source of danger to the herd from the prevalence of wild beasts. ”

“ We have seen that he behaves as if the herd were the only environment in which he can live, that he is especially sensitive to impulses coming from the herd, and quite differently affected by the behaviour of animals not in the herd. Let us now try to estimate the mental aspects of these impulses. Suppose a species in possession of precisely the instinctive endowments which we have been considering, to be also self-conscious, and let us ask what will be the forms under which these phenomena will present themselves in its mind. ”

“ Hence a struggle may often be observed in animals between different instincts, or between an instinct and some habitual disposition; as when a dog rushes after a hare, is rebuked, pauses, hesitates, pursues again, or returns ashamed to his master; or as between the love of a female dog for her young puppies and for her master,—for she may be seen to slink away to them, as if half ashamed of not accompanying her master. But the most curious instance known to me of one instinct getting the better of another, is the migratory instinct conquering the maternal instinct. ”

“ Some writers regard them as "inherited habits," while others, with apparent justice, doubt if mere habits or voluntary actions repeated till they become a "second nature" ever leave a trace upon heredity. Such investigators regard instinct as the natural survival of those methods of automatic response which were most useful to the life of the animal, the individual having less effective methods of reflex action perishing, leaving no posterity. ”

“ But calves rarely show any particular wildness to the men who have been in contact with them during the first days of their life, when the instinct to attach themselves is uppermost, nor do they dread strangers as they would if brought up wild.
Chickens give a curious illustration of the same law. Mr. Spalding’s wonderful article on instinct shall supply us with the facts. These little creatures show opposite instincts of attachment and fear, either of which maybe aroused by the same object, man. If a chick is born in the absence of the hen, it “will follow any moving object. ”

“ In studying the behaviour of wild animals under natural conditions, it must always be difficult to distinguish the congenital basis from the acquired elements; for both tend to bring about a working adjustment to the conditions of life, and we can seldom have opportunities of tracing the interplay of the factors which produce the instinct-habits of adult life. [137] But under domestication we seek to bring about a new working adjustment to conditions imposed by man. The skilful trainer utilizes the natural instinctive tendencies as a basis ”

“ Their case was precisely analogous to that of the Adirondack calves. The two opposite instincts relative to the same object ripen in succession. If the first one engenders a habit, that habit will inhibit the application of the second instinct to that object. All animals are tame during some phase of their infancy. Habits formed then limit the effects of whatever instincts of wildness may later be evolved. ”

“ It is the group of purely animal instincts that first show themselves in the young, and those even, as we see in the young of the lower animals, generally appear somewhat in the order in which they are required for the individual's good. Birds just hatched from the egg seem to have, for the first few days, only one instinct ready for action—that of opening their mouths wide at the approach of any thing towards their nest. ”

“ That instinctive actions can be modified or inhibited by intelligence and will is proved by any trained beast of prey which masters its hunger and the impulse to snap at the piece of flesh held before it, because it knows that if it does not control itself painful blows will be the consequence. In a later lecture I shall return to the connexion between will and instinct; all that concerns us here is to regard instincts as the outcome of the processes of selection, and as an indirect proof of the reality of these. ”

“ You will hear it stated, by some, that there are just two instincts, and that all instinctive behavior belongs under the head of one or the other of these two. The one is the instinct to preserve one's individual life, and the other is the instinct to propagate the species. Mating, nesting and care of the young come under the reproductive instinct, while feeding, flight from danger, and shunning extreme heat or cold are modes of self-preservation. This seems logical enough, but it is very bad psychology. ”

“ A very common way of talking about these admirably definite tendencies to act is by naming abstractly the purpose they subserve, such as self-preservation, or defence, or care for eggs and young—and saying the animal has an instinctive fear of death or love of life, or that she has an instinct of self-preservation, or an instinct of maternity and the like. ”

“ The elephant, the horse, the dog, the pig, even birds may be taught a great deal."
"But then, papa, I still wish to know where the line is to be drawn between reason and instinct."
"I was about to come to that very point, William. When animals follow their instinct in providing their food, bringing up their young, and in their precautions against danger, they follow certain fixed rules, from which they never deviate. But circumstances may occur against which their instinct can afford them no regular provision; then it is that their reasoning powers are called into action. ”

“ We already know a series of examples, in which such adaptations, after they had been transmitted through a succession of generations, finally appeared as innate instincts, and yet they have only been acquired from the ancestors of the animals. Inheritance has here caused the result of training to become instinct. The characteristic instincts of sporting dogs, shepherd’s dogs, and other domestic animals, and the natural instincts of wild animals, which they possess at birth, were in the first place acquired by their ancestors by adaptation. ”

“ The chick does not seize the ladybird. Why? Because there is an acquired connection between scenes 1 and 2 of the previous act. The chick has gained experience of the nauseous character of the insect, and this experience influences and modifies his behaviour. The essentially new feature, [120] therefore, is the establishment of a connection which is not provided through inheritance. To put the distinction in a brief form, we may say that instinct depends on how the nervous system is built through heredity; while intelligence depends upon how the nervous system is developed through use. ”

“ Thus we call the sentiment which leads the Birds to perform so many admirable actions, instinct. The tenderness of the mother for her young for instance—a tenderness so full of delicacy and foresight, is, we say, only the result of instinct. It is agreed, however, that this instinct singularly resembles the intelligence called reason. ”

“ Who can believe, for example, that a new-born baby is aware of the necessity of food for preserving life? Or that insects, in laying eggs, are concerned for the preservation of their species? The essence of instinct, one might say, is that it provides a mechanism for acting without foresight in a manner which is usually advantageous biologically. ”

“ If we were to behold one kind of wolf, when young and without any training, as soon as it scented its prey, stand motionless like a statue, and then slowly crawl forward with a peculiar gait; and another kind of wolf rushing round, instead of at, a herd of deer, and driving them to a distant point, we should assuredly call these actions instinctive. Domestic instincts, as they may be called, are certainly far less fixed than natural instincts ”

“ For example, the accomplishment of pointing at game, although a pure result of education, appears in the young pups brought up apart from their parents and kind. The peculiar leap of the Irish horse, acquired in the course of traversing a boggy country, is continued in the progeny brought up in England. This hereditariness of specific habits suggests a relation to that form of psychological demonstration usually called instinct; but instinct is only another term for mind, or is mind in a peculiar stage of development ”

“ As applied to the wild things, we often stumble on to the terms, instinct of direction, instinct of migration, instinct of song, instinct of nest building, and so on. Webster gives several definitions as to the meaning of instinct. The following covers the ground:
"An instinct is an agent which performs blindly and ignorantly a work of intelligence and knowledge."
To gather acorns in the balmy days of October and store them for the cold of winter, is a work of intelligence and knowledge. Can we believe that the blue jays and squirrels perform this work blindly and ignorantly? ”

“ Without this instinctive power of determining the relative distance and figure of objects, the young of most animals would perish before their sense of sight could be perfected, as ours is, by experience.
We have now noticed the chief characteristics of instinct: its existence prior to all experience or instruction; its incapacity of improvement, except within the narrow sphere of domestication; its limitation to a few objects, and the certainty of its action within these limits; the distinctness and permanence of its character for each species; and its constant hereditary nature. ”

“ The mating instinct, in unsophisticated members of the human species, is another perfect example. So is the hunting instinct in a dog; when this instinct is aroused, the animal makes a lot of movements of various sorts, responses to various particular stimuli, but evidently these movements are not sufficient to quiet the tendency, for they continue till the prey is captured. The behavior of a gregarious animal when separated from his fellows shows the same sort of thing. Take a young chick out of the brood and fence it away from the rest. ”

“ According to Frederic Cuvier, who has so clearly distinguished between instinct and intelligence in animals, 'instinct is a natural and inherent faculty, like feeling, irritability, or intelligence. The wolf and the fox who recognize the traps in which they have been caught, and who avoid them; the dog and the horse, who understand the meaning of several of our words, and who obey us,—thereby show intelligence. The dog who hides the remains of his dinner, the bee who constructs his cell, the bird who builds his nest, act only from instinct. ”

“ II.—Instinctive Behaviour in Insects
Since instinctive behaviour is, by definition, independent of experience, and since the animals which act instinctively are also, in many cases, able to act intelligently, it is clear that, apart from hereditary variations, we must expect to find acquired modifications of instinct. As Huber said of bees, their instinctive procedure often indicates “a little dose of judgment.” It is, indeed, exceedingly difficult, as a matter of observation, to distinguish between hereditary variation and acquired modification. ”

“ Altruistic instincts are those which relate to parenthood and those which are concerned with the mass of individuals of the same species. The latter may be called the social instincts. In the former class, the instincts of parenthood, may be included the instinct of courtship, reproduction, home-making, nest-building, and care for the young. Most of these are feebly developed among fishes. ”

“ But every biologist recognizes gregariousness, approach in its social form, the basal instinct which crowds animals into herds and is manifested in the flight of birds in flocks, protectiveness, the instinctive attitude of parent to offspring, and imitation, the instinctive attitude toward leaders or parents, as primitive endowments of animal and of human selves. ”

“ Such change would, of course, be relative, and might be due, either to new conditions brought to bear on the animal, or to the animal being itself brought, in the expansion of its life, within their influence. The old instinct is no longer quite adapted to the changed circumstances. ”

“ As we have here independent testimony of two good observers to a fact which in itself is not improbable, I think we may conclude that the nest-making instinct admits of being supplemented, at any rate in some birds, by the experience and intelligence of the individual. ”

“ The group of instincts which we class as imitative (and they afford only the foundations on which intelligent imitation is based) are of biological value chiefly, if not solely, in those species which form larger or smaller communities.
The study of instinct is in the genetic treatment of evolutionary science a study in heredity. The favouring bionomic conditions are those of a relatively constant environment under which relatively stereotyped responses are advantageous. If the environment be complex, there is a corresponding Relation to heredity complexity in instinctive behaviour. ”