Which is the most difficult bird to shoot? You may put this question to a dozen sportsmen; probably no two will name the same bird, and each will be able to give excellent reasons why the particular fowl he mentions is the hardest to hit. The reason for this diversity of opinion is simply that there exists no bird more difficult to shoot than all others. Even as beauty is said to be in the eye of the beholder, so does the difficulty, or otherwise, of shooting any particular species depend upon the idiosyncrasies of the would-be slayer. To some shooters all birds, with the possible exception of the coot, are difficult to bring down, while others are able to make every flying thing appear an easy mark.
To my way of thinking the chukor (Caccabis chucar) takes a lot of hitting, but this species receives much help on account of its mountainous habitat. It is difficult to hit even a hoary old peacock if the bird gets up when you, already pumped to exhaustion by a stiff climb, are engaged in scrambling from one terraced field to another with your gun at “safe.” The chukor, thanks to the fact, conclusively proved by our friend Euclid, that any two sides of a triangle are greater than the third, enjoys so great an advantage over thewinglessshikarithat it would be a contemptible creature were it not difficult to shoot. Were I the leader of a covey of chukor, I should thoroughly enjoy an attempt to shoot me. Having taken up a strategic position near the summit of a steep hill, I should squat there in full view until the sportsman had by laborious effort climbed to a spot some hundred and twenty yards from where I was sitting; I should then gracefully retire with my retinue across thekhudto the opposite hill, and watch with interest the shooter clamber down one limb of an isosceles triangle and swarm up the other. Some time before he had completed the operation I should again proceed to give him a practical demonstration of the fact that the base of certain triangles is considerably shorter than the sum of the other two sides.
LOTEN’S SUNBIRD (HEN) ABOUT TO ENTER NESTLOTEN’S SUNBIRD (HEN) ABOUT TO ENTER NEST
LOTEN’S SUNBIRD (HEN) ABOUT TO ENTER NEST
If you take away from the chukor his natural advantages I am inclined to think that the grey partridge (Francolinus pondicerianus) is the more difficult bird to shoot. This species is common in most parts of India, yet I do not remember ever having heard of any one making a big bag of grey partridge. Some there are who say that the bird is not worth shooting. If these good folk mean that the shooting of the partridge involves so large an expenditure of ammunition as to deter them from the undertaking I am inclined to agree with them. Given a fair field in the shape of a plain well studded with prickly pear, there is, in my opinion, no bird more difficult to hit than the grey partridge. It is, like all game birds proper, a very rapid flier for a short distance. But it is not so much this which makes it hard to shoot as the rapidity with which it can run along the ground and the close manner in which it lies up. According to Mr. Lockwood Kipling, the grey partridge, as it runs, “suggests a graceful girl tripping along with a full skirt well held up.” In a sense the simile is a good one, for the lower plumage of the partridge is curiously “full,” and so does make the bird look as though it were holding up its skirts. But until graceful young ladies are able to gather up their ample skirts and sprint the “hundred” two or three yards inside “level time,” it will be inaccurate to compare the tripping gait of the one to the speedy motion of the other. The grey partridge is a winged sprinter, a feathered Camilla. It can for a short distance hold its own comfortably against a galloping horse. Frequently have I come upon a covey, feeding in the open and giving vent to the familiar call, and have immediately proceeded to stalk it in the hopes of obtaining a couple of good shots. Before getting within range, one of the birds invariably “spots” me and gives the alarm. The calling immediately ceases and the partridges walk briskly to cover. The instant they disappear I dash towards the cover, hoping to surprise and flush them, but they run three yards to my two, and by the time I reach the bushes into which they betook themselves they are laughing at me from afar.
Then the way in which a partridge will sometimes lie up in comparatively thin cover is remarkable. One day, when shooting snipe at sunrise, I surprised a partridge feeding in a field. I fired, but apparently did not hit the bird, for it disappeared into a clump of palm trees and prickly pear. Taking up a position close tothis clump, I instructed my beaters to throw stones into it. This they did, but half a dozen stones, to say nothing of as many chunks of clay and the most frantic yells and shouts, elicited no response from the partridge. I therefore moved on, and the moment I had turned my back on the clump the bird flew out! This is typical of my experience as a partridge shooter; the birds almost invariably get up from cover at a moment when I cannot possibly take a shot at them. Well might I sing with Cowper—
I stride o’er the stubble each day with my gunNever ready to shoot till the covey is flown.
I stride o’er the stubble each day with my gun
Never ready to shoot till the covey is flown.
For these reasons partridge shooting is to me a particularly exasperating form of sport. There are few things more annoying than to hear—“the partridge burst away on whirring wings,” from a bush on which you have just turned your back after having thrown into it half the contents of a ploughed field!
I am not a bloodthirsty individual, and enjoy watching birds through a field-glass quite as much as, if not more than, shooting them with a gun, but there is something in the call of the grey partridge which makes me want to shoot him. His shrill “pateela, pateela, pateela,” seems to be a challenge. Grahame sings—
CheerilyThe partridge now her tuneless call repeats.
Cheerily
The partridge now her tuneless call repeats.
For “cheerily” write “cheekily” and you have a good description of the call of our Indian grey partridge, which may be heard in Madras every morning during the winter months.
This bird does not build an elaborate nest. There is no necessity for it to do so. A nest is a nursery in which young birds are for a time sheltered from the dangers that beset them in the world. When they have developed sufficiently to be able to look after themselves they leave the nest.
It is one of the characteristics of the gallinaceous family of birds, which includes grouse, poultry, pea- and guinea-fowl, pheasants, turkeys, and quail, that their young are able to run about almost immediately after issuing from the egg. They are born covered with down, and are thus at first very unlike their parents. They are in reality larvæ, that is to say, embryonic forms which are able to fend for themselves with little or no assistance from their parents. They change into the adult form, not hidden away in a nursery, but in the open world.
The nest, then, of the partridge is a very insignificant affair. It is usually a depression in the ground, so shallow as to be barely perceptible, and always well concealed in a bush or tuft of grass. Sometimes the eggs are laid on the bare soil, but more usually the depression is lined with grass or leaves. Occasionally the lining is so thick as to form a regular pad. From six to nine whitish eggs are laid. These do not match the ground or material on which they lie, hence cannot be considered as examples of protective colouring. Their safety depends on the fact that they are hidden away under a bush or tuft of grass. The hen, too, is a very close sitter, and her plumage assimilates well with the surroundings of the nest.
I have hinted more than once at the possibility of there being some understanding between the architect of my bungalow and the feathered folk. On this hypothesis alone am I able to account for the presence of a rectangular hole in the porch, about eight feet above the level of the ground, a hole caused by the deliberate omission of one or two bricks. The scramble for this cavity by those species of birds which build in holes is as great as that of Europeans to secure bungalows in a Presidency town. Last year a pair of spotted owlets (Athene brama) secured the prize and reared up a noisy brood of four. These were regarded with mingled feelings by the human inhabitants of the bungalow. On the one hand, a bird more amusing than the clownish little owlet does not exist; on the other, it is excessively noisy. Each member of the family talks gibberish at the top of its voice, sixteen to the dozen, and as all will persist in speaking at once, the result is a nocturnal chorus that will bear comparison with the efforts of the cats which enliven the Londoner’s back yard.
THE INDIAN SPOTTED OWLET. (ATHENE BRAMA)THE INDIAN SPOTTED OWLET. (ATHENE BRAMA)
THE INDIAN SPOTTED OWLET. (ATHENE BRAMA)
This year a couple of mynas (Acridotheres tristis) secured the highly desirable nesting site. Immediately on entering into possession they proceeded to cover the floor of the cavity with a collection of rubbish, composed chiefly of rags, grass, twigs, and bits of paper. There was no attempt at arranging this rubbish, it was bundled pell-mell into the hole and four pretty blue eggs were laid on top of it.
One might suppose that the more intelligent the bird the greater the degree of architectural skill it would display. This, however, is not the case. Were it so, crows, mynas, and parrots would build palatial nests.
Mynas do not always nestle in holes in buildings; they are content with any kind of a cavity, whether it be in a building, a tree, or a sandbank. In default of a hole they are content with a ledge, provided it be covered with a roof. A few years ago a pair of mynas reared up a brood on a ledge in the much-frequented verandah of the Deputy Commissioner’s Court at Fyzabad.
To return to the nest in my porch. The eggs in due course gave rise to four nestlings of the ordinary ugly, triangular-mouthed, alderman-stomached variety. When they were nearly ready to leave the nest I took away two of them by way of rent for the use of my bungalow. This action was in complete accord with oriental custom. In India the landlord has, from time immemorial, taken from his tenants a portion of their produce as rent or land revenue. The Congress will doubtless declare that in levying 50 per cent. of the family brood I assessed the family too highly; but I defy even a Bengali orator to take 33 per cent. of four young mynas. I might, it is true, have assessed the rent at 25 per cent., but the life of a solitary myna cannot be a very happy one, so I took two, a cock and a hen.
To the ordinary observer the cock myna is as like the hen as one pea is like any other pea. To one, however, who has an eye for such things, the bigger head and more massive body of the cock render him easily recognisable when in company with his sisters. The brood consisted of two cocks and two hens, so that I made a fair division. Some there are who may question the ethics of my action. I would remind such that, incredible as it may seem, the parent birds, in all probability, did not miss the two young ones. Birds cannot count. Even the wily crow is unable to “spot” the extra egg which the koel has surreptitiously introduced into the nest. It is, of course, possible that although those mynas could not count, they missed the two young birds to the extent of noticing that something was wrong with their brood. If they did all I can say is that they concealed their feelings in an admirable manner, for they continued to feed the remaining young as though nothing had happened. If it be thought incredible that the young birds were not missed, is it not equally hard to believe that not one of the lower animals can tell the difference between two and three? If a dog has three bones before him and you remove one of them, he will not miss it unless he sees you remove it!
Achaprassiwas appointed to nurse my two young mynas, with instructions to keep them until they should become somewhat more presentable. At the end of three weeks they were adjudged fit to appear in public, being somewhat smaller and rather lanky editions of their parents, with the patch behind the eye white instead of yellow. Having been taken from the nest they wereperfectly tame, showing no fear of man, and readily accepting food from the hand.
Young nestlings display no fear of man, and do not appear to mind being handled by a human being; but as they grow older they learn to fear all strange creatures, hence it is that captive birds taken from the nest are always tamer than those which are caught after they are fledged. It was amusing to see the way in which my young mynas ran towards thechaprassiwhen he called “Puppy, puppy.” “Puppy” is apparently a term applied by native servants indiscriminately to any kind of pet kept by asahib.
Mynas make excellent pets because they are so alert and vivacious, and, above all, because they have so much character.
A myna is a self-assertive bird, a bird that will stand no nonsense.
I know of few things more amusing than to witness a pair of mynas give a snake a bit of their minds as they waltz along beside it in a most daring manner.
Owing to the self-assertion of the myna he is apt to be quarrelsome.
Street brawls are, I regret to say, by no means uncommon. In these two or three mynas attack one another so fiercely that they get locked together and roll over and over—a swearing, struggling ball of brown, yellow, and white.
The myna, although by no means a songster, is able to emit a great variety of notes, all of which must be familiar to every Anglo-Indian.
A bird which can produce a large number of soundsis almost invariably a good mimic, and the common myna is no exception to this rule. In this respect, however, he does not compare favourably with the grackles or hill-mynas, as they are commonly called. These can imitate any sound, from the crack of a whip and the exhortations of a bullock-cart driver to the throat-clearing operation in which our Indian brethren so frequently indulge.
Swifts are extraordinary birds; there are no others like unto them; they are the most mysterious of the many mysterious products of natural selection; their athletic feats transcend the descriptive powers of the English language. What adjective is there of suitable application to a bird that speeds through the air without an appreciable effort at the rate of a hundred miles an hour, that traverses a thousand miles every day of its existence?
These wonderful birds are everywhere common, yet much of their life history requires elucidation.
Probably not one man in fifty is able to distinguish between a swallow and a swift. Some think that “swift” and “swallow” are synonymous terms, while others believe that a swift is a kind of black swallow. As a matter of fact, the swift differs more widely from the swallow than the crow does from the canary. There is, it is true, a very strong professional likeness between the swift and the swallow, but this likeness is purely superficial; it is merely the resemblance engendered by similar modes of obtaining a livelihood. Both swallows and swifts feed exclusively on minute insects which they catch upon the wing, hence both have a large gape, light, slender bodies, and long, powerful wings. But speedy though it be, the swallow is not in the sameclass with the swift as a flyer. When both birds are in the hand nothing is easier than to tell a swift from a swallow or a martin. The latter have the ordinary passerine foot, which consists of three forwardly directed toes and a backwardly directed one. This foot enables a bird to perch, so that one frequently sees swallows seated on telegraph wires. But one never sees a swift on a perch, because all its four toes point forward. It cannot even walk. It spends its life in the air. It eats and drinks on the wing, it does everything, except sleeping and incubating, in the air.
But it is not often that one has a swallow or swift in the hand; it is difficult to get near enough to them to put salt on the tail, so that it is necessary to have some means of distinguishing them when sailing through the air. There is a very marked difference in the manner in which these birds use their wings. This is inimitably described by Mr. E. H. Aitken: “As a swallow darts along, its wings almost close against its sides at every stroke, and it looks like a pair of scissors opening and shutting. Now a swift never closes its wings in this way. It whips the air rapidly with the points of them, but they are always extended and evenly curved from tip to tip like a bow, the slim body of the bird being the arrow.” As a swift speeds through the air it looks something like an anchor, with a short shaft and enormous flukes. If this be borne in mind, it is scarcely possible to mistake a swift for a swallow. Swifts are abundant in Calcutta, but one is not likely to come across a swallow there except when the moon happens to be blue.
The two swifts commonly seen in Calcutta are theIndian swift (Cypselus affinis) and the palm swift (C. batassiensis).
The latter need not detain us long. It is a small and weak edition of the former. It builds a cup-shaped nest on the under side of the great fan-like leaves of the toddy palm.
The Indian swift is, in size and appearance, much like the swift which visits England every summer, except for the fact that it has a white patch on the lower part of the back. The chin is white, but all the rest of the plumage, with the exception of the above-mentioned patch, is black or smoky brown.
This bird nests in colonies in the verandahs of houses and inside deserted buildings. The nest is a cup-shaped structure, usually built under an eave in the angle which a roof-beam makes with the wall. Thus the swift finds, ready-made, a roof and a couple of walls, and has merely to add the floor and remaining walls, in one of which it leaves a hole by way of entrance to the nursery. Thus the swift reverses the usual order of things, which is to erect a nest on some foundation such as a branch or ledge.
As we have seen, all four toes of the swift are forwardly directed and each is terminated by a sharp hook-like claw. Thus the swift is able to cling with ease to such a vertical surface as that of a wall, and is therefore quite independent of any ledge or perch. The nest is a conglomeration of grass, straw, and feathers, which are made to adhere to one another, and to the building to which the nest is attached, by the cement-like saliva of the bird.
Some species of swift build their homes entirely of their glutinous saliva, and so manufacture “edible birds’ nests.” The Indian swift, however, utilises all manner of material by way of economising its saliva.
Nest building is a slow process. Each tiny piece of material has to be separately stuck on to the structure, and the saliva, which is, of course, liquid when first secreted, takes about five minutes to dry. During the whole of this time the bird remains motionless, holdingin situwhatever it is adding to the structure.
I once timed a pair of swifts at work, and found that on an average they took forty-five minutes in bringing each new piece of material. Much of this time was undoubtedly spent in seeking for food, for so active a bird as the swift must have an enormous appetite, and, as it feeds on the minutest of insects, must consume thousands of them in the course of the day, each of which has to be caught separately. But, even allowing for this, the rate at which the material is added is very slow. Some naturalists declare that the swift is unable to pick anything off the ground. If this be so, the labour of obtaining material must be great, for the creature must fly about until it espies a feather or piece of straw floating in the air.
I am not yet in a position to say whether it is really impossible for the bird to pick anything from off the ground. I have never seen it do so, and it is a fact that the birds will, when building, eagerly seize anything floating in the air. On the other hand, the helplessness of the swift when placed upon the ground has been much exaggerated. It is said that the bird, if put upona flat surface, is unable to rise and will remain there until it dies. Quite recently some Indian swifts were brought to me and I placed one of them on my desk. In less than twenty seconds the bird was flying about in the room. Then, again, the grasping powers of its hook-like claws have been somewhat magnified. The bird in question made several unsuccessful attempts to cling on to the whitewashed wall, and eventually fell to the floor, where it was seized and then liberated in the open. It flew off none the worse for its adventure. Nevertheless, its claws are very sharp; the bird in question stuck them quite unpleasantly into me when I held it. A swift can certainly cling to any vertical surface that is the least rough.
Unlike most birds, swifts use their nests as houses and sleep in them at night. One frequently hears issuing from the rafters in the dead of night the piercing scream so characteristic of swifts. This disposes of the silly story, so prevalent, that at evening time the swifts mount into the higher layers of the atmosphere and there sleep on the wing.
In conclusion, I must mention the characteristic flight of swifts just before sundown. The birds close the day in what has been called “a jubilant rout”; as if they had not already taken sufficient exercise, they fly at a breakneck pace round about the building in which their nests are placed, dodging in and out of the pillars of the verandah, and fill the air with their shivering screams. This seems to be a characteristic of swifts wherever they are found.
The sudden change that comes over the nature of most birds at the nesting season is, perhaps, the most wonderful phenomenon in nature. Active, restless birds, which normally spend the whole day on the wing, are content to sit motionless in a cramped position upon the nest for hours together. Birds of prey, whose nature it is to devour every helpless creature that comes within their grasp, behave most tenderly towards their young, actually disgorging swallowed food in order to provide them with a meal. Timid birds become bold. Those which under ordinary circumstances will not permit a human being to approach near them, will sometimes, while brooding, actually allow themselves to be lifted off the nest.
At the breeding season intelligence, which counsels self-preservation, gives way before the parental instinct, which causes birds to expose themselves to danger, and, in some cases, even to sacrifice their lives for the sake of their offspring.
From the construction of the nest until the time when the young ones are fledged the actions of the parent birds are, at any rate in the neighbourhood of the nest, those of automata, rather than of creatures endowed with intelligence.
On this hypothesis alone are many of the actions of nesting birds comprehensible.
That the construction of the nest is in the main an instinctive habit and not the result of intelligence is proved by the fact that a bird which has been hatched out in an incubator will, at the appointed season, build a nest. If birds were not guided by instinct they would never take the trouble to do such a quixotic thing. What benefit can they derive from laboriously collecting a number of twigs and weaving them into a nest?
It is, of course, natural selection that has originated this instinct; for those species in which the parental instinct is not developed, or in which there is not some substitute for it, must inevitably perish. When once this instinct has taken root natural selection will tend to perpetuate it, since those species which take the best care of their young are those which are likely to survive in the struggle for existence.
Many instances can be adduced to show how automatic are the actions of birds at the nesting season.
It sometimes happens that a bird lays an egg and then proceeds to build a nest on top of it.
Again, some birds do not know their own eggs. A whole clutch of different ones may be substituted for those upon which the bird is sitting and the bird will not discover the change.
The well-known bird-photographer, Mr. R. Kearton, was desirous of obtaining a good photograph of a sitting thrush, and as he was afraid that her eggs would be hatched before a fine, sunny day presented itself, had some wooden dummies made. These he painted andvarnished to look like those of the thrush, and put them in the nest, wondering whether the bird would be deceived. He need not have wondered; she would probably have sat upon the shams even had they not been coloured.
Upon another occasion Mr. Kearton replaced some starling nestlings by his wooden eggs, and waited to see what would happen. “In a few minutes,” he writes, “back came the starling with a rush. She gazed in wonder at the contents of the nest for a few seconds, but, quickly making up her mind to accept the strangely altered condition of things, she sat down on the bits of painted wood without a trace of discontent in either look or action. Putting her off again, I reversed the order of things and waited. Upon returning, the starling stared in amazement at the change that had come over the scene during her absence; but her curiosity soon vanished, and she commenced to brood her chicks in the most matter-of-fact way.” Then Mr. Kearton took out the chicks and put his fist into the nest, so that the back of his hand was uppermost. The starling actually brooded his knuckles. We must, of course, remember that a starling’s nest is in a hole, where there is but little light. But, provided the starling could not see him, I believe that she would have brooded his knuckles in broad daylight.
Crows, the most intelligent of birds, will sit upon and try to hatch golf balls and ping-pong balls. One famous kite in Calcutta sat long and patiently in a vain attempt to make a pill-box yield a chick, while another member of this species subjected a hare’s skull to similar treatment.Upon one occasion I took a robin’s egg that was quite cold and placed it among the warm ones in a blackbird’s nest. The hen came and brooded the egg along with her own without appearing to notice the addition, although it was much smaller than her eggs and of a totally different colour.
In the same way, if a set of nestlings of another species be substituted for those already in the nest, the parent birds will usually feed the new family without noticing the change. Instinct teaches a bird to brood all inanimate objects it sees in the nest and to feed all living things, whether they be its own offspring or not, and many birds blindly obey this instinct. It is, of course, to the advantage of the species that this should be so. For it is only on very rare occasions that foreign objects get into a nest, and nature cannot provide for such remote contingencies.
Similarly, instinct will not allow a bird to pay any attention to objects outside the nest, even though these objects be the bird’s own offspring.
As everybody knows, the common cuckoo nestling ejects its foster-brethren from the nest, and if the true parents were able to appreciate what had happened, how much sorrow among its victims would the cuckoo cause! As a matter of fact, no sorrow at all is caused. Incredible as it may seem, the parent birds do not miss the young ones, nor do they appear to see them as they lie outside the nest. In this connection I cannot do better than quote Mr. W. H. Hudson, who was able to closely observe what happened when a young cuckoo had turned a baby robin out of the nest. “Here,”writes Hudson, “the young robin when ejected fell a distance of but five or six inches, and rested on a broad, light green leaf, where it was an exceedingly conspicuous object; and when the mother robin was on the nest—and at that stage she was on it the greater part of the time—warming that black-skinned, toad-like, spurious babe of hers, her bright, intelligent eyes were looking full at the other one, just beneath her, which she had grown in her body and had hatched with her warmth, and was her very own. I watched her for hours; watched her when warming the cuckoo, when she left the nest, and when she returned with food and warmed it again, and never once did she pay the least attention to the outcast lying there close to her. There on its green leaf it remained, growing colder by degrees, hour by hour, motionless, except when it lifted its head as if to receive food, then dropped it again, and when at intervals it twitched its body as if trying to move. During the evening even these slight motions ceased, though the feeblest flame of life was not yet extinct; but in the morning it was dead and cold and stiff; and just above it, her bright eyes upon it, the mother robin sat on the nest as before warming the cuckoo.”
Even those actions of nesting birds which appear to be most intelligent can be shown to be merely automatic. Take, for example, the curious habit of feigning injury, which some birds have, when an enemy approaches the young, in order to distract attention from them to itself and thus enable them to seek cover unobserved. This surely seems a highly intelligent act. But birds sometimes act thus before the eggs are hatched, and by sodoing actually attract attention to the eggs. This action is purely instinctive, and is perpetuated and strengthened by natural selection because it is beneficial to the race.
We have seen how at the nesting season all a bird’s normal actions and instincts are subordinated to those of incubation. It is therefore but reasonable to suppose the incubating bird to be in a very peculiar and excitable state, a state bordering on insanity.
A bird in this condition might be expected to go into something resembling convulsions on the approach of an enemy, and, provided its acts under such circumstances tended to help the offspring to escape, and were at the same time not sufficiently acute to cause the mother bird to fall a victim to the enemy, natural selection would tend to perpetuate and fix such actions.
Want of space prevents further dilation upon this fascinating subject.
To sum up the conclusions I desire to emphasise. A bird has during the greater part of its life only to look after itself, and the more intelligent it be the better will it do this, hence natural selection tends to increase the intelligence of birds. But, at certain seasons, it becomes all-important to the species that the adults should attend to their young, even at risk to themselves. To secure this Nature has placed inside birds a force, dormant at most times, which at periodic intervals completely overrides all normal instincts, a force which compels parent birds to rivet their attention on the nest and its contents. Thus the sudden conversion of birds into automata is a necessity, not a mere whim of Dame Nature. The instinct is not of very long duration; for as soon as theyoung are able to fend for themselves, the parents sometimes behave in what seems to human beings a most unnatural way: they drive off their offspring by force. As a matter of fact, this behaviour is quite natural; it is dictated by Nature for the benefit of the species. Strong as the maternal instinct is, it is liable to be overridden by stronger instincts, such as that of migration. When the time for the migratory journey comes round, the parent birds will desert, without apparently a pang of remorse, or even a thought, the broods for whose welfare they have been slaving day and night. This desertion of later broods by migratory birds is far commoner than is generally supposed. In 1826 Mr. Blackwell inspected the house-martins’ nests under the eaves of a barn at Blakely after the autumnal migration of these birds. Of the twenty-two nests under the eaves inspected on 11th November, no fewer than thirteen were found to contain eggs and dead nestlings.
Ornithological experience led me some time back to the belief that at the nesting season a bird becomes a creature of instinct, an organism whose actions are, for the time being, those of a machine, a mere automaton. This view, which has been set forth in the preceding article, is not held by all naturalists. I therefore determined to undertake a systematic series of experiments with a view to putting it to the test. In other words, I decided to play cuckoo. I selected the Indian crow (Corvus splendens) as the subject of my experiments, because it is the most intelligent of the feathered folk. If it can be proved that when on the nest the actions of this bird are mechanical, it will follow that the less intelligent birds are likewise mere automata when incubating. Another reason for selecting the crow as my victim is that I have been investigating the habits of the koel (Eudynamis honorata), which is parasitic on the crow, and in so doing have had to visit a large number of crows’ nests.
The crow lays a pale blue egg blotched with brown, while the egg of the koel is a dull olive-green also blotched with brown. It is considerably smaller than the crow’s egg. I have seen dozens of koel’s eggs, but never one thata human being could possibly mistake for that of a crow, yet our friendCorvusis unable to detect the strange egg when deposited in the nest and sits upon it. It is not that birds are colour-blind. The koel is able to distinguish its own egg from that of the crow, for, after it has deposited its egg, it frequently returns to the nest and removes one or more of the crow’s eggs! I am convinced that ordinarily a crow would have no difficulty in distinguishing between the two kinds of egg; but at the nesting time it throws most of its intelligence to the winds and becomes a puppet in the hands of its instincts, which are to sit upon everything in the nest.
I have myself placed koel’s eggs in crows’ nests, and in every case the crow has incubated the eggs. On one occasion I came upon a crow’s nest containing only two koel’s eggs. As the nest was some way from my bungalow and in an exposed situation, I knew that, the moment I left, it would be robbed by some mischievous native boy, so I took the eggs and placed them in a crow’s nest in my compound. This already contained three crow’s eggs, two of which I moved, substituting the koel’s eggs for them. The crow’s eggs had only been laid three or four days, but the koel’s eggs were nearly incubated, since both yielded chicks on the third day after I placed them in the nest. If nesting crows think, that pair must have been somewhat surprised at the speedy appearance of the chicks!
In all, I have placed six koel’s eggs in four different crow’s nests, and as I have already said, in no single instance did the trick appear to be detected. In the majority of cases, I did not trouble to keep the numberof eggs in the nest constant. I merely added the koel’s egg to those already in the nest.
But I have put my theory to a much more severe test. In a certain crow’s nest containing two eggs I put a large fowl’s egg. This was cream-coloured and fully three times the size of the crow’s egg, yet within ten minutes the crow was sitting comfortably on the strange egg. She did not appear to notice the considerable addition to her clutch. She subsequently laid three more eggs, so that she had six eggs to sit upon, five of her own and the large fowl’s egg! Day after day I visited the nest and watched the progress of the strange egg. On the twentieth day the chick inside was moving, but when I went to the nest on the twenty-first day I discovered that some one had climbed the tree, for several branches were broken. Two young crows had been taken away and the fowl’s egg thrown upon the ground. There it lay with a fully formed black chicken inside! I have that chicken in a bottle of spirit. Subsequent inquiry showed that thedhobi’sson had taken it upon himself to spoil my experiment. However, it went sufficiently far to prove that crows may one day become birds of economic value; why not employ them as incubators? Had the crow come across that chick’s egg anywhere but in its nest, it would undoubtedly have made its breakfast off it.
I repeated the experiment in another nest. This time the chick hatched out. When it appeared the rage of the crows knew no bounds. With angry squawks the scandalised birds attacked the unfortunate chick, and so viciously did they peck at it that it wasin a dying state by the time my climber reached the nest.
With a view to determining at what stage the incubating instinct secures its dominance, I placed another fowl’s egg in a crow’s nest that was almost ready to receive eggs, wondering whether the presence of this egg would stimulate the crow to lay, without troubling to give the final touches to the nest. The bird devoured the egg. It is my belief that the acts of a nesting bird do not become completely automatic until it has laid an egg in the nest. If one visits a crow’s nest which is in course of construction, the owners will as likely as not desert it; but I have never known a crow desert its nest when once it has laid an egg—provided, of course, he who visits the nest leaves any eggs in it.
In another nest containing two crow’s eggs I placed a golf ball; on returning next day I found the crow sitting tight upon her own two eggs and the golf ball!
But in another case, where I had found two eggs and substituted for them a couple of golf balls, the crow refused to sit. I suppose the idea was, “I may be a bit of a fool when I am nesting, but I am not such a fool as all that!” I once came across a young koel and a crow’s egg in a nest. I removed the former and placed it in a crow’s nest containing four crow’s eggs. The owner of the nest showed no surprise at the sudden appearance of the koel, but set about feeding it in the most matter-of-fact way. The young koel was successfully reared; it is now at large and will next year victimise some crow. I may say that no human being could possibly fail to distinguish between a young koel and a young crow. When first hatched the koel has a black skin, the crow a pink one. The mouth of the crow nestling is an enormous triangle with great fleshy flaps at the side; the mouth of the koel is much smaller and lacks the flaps. The feathers arise very differently in each species, and whereas those of the crow are black, those of the koel are tipped with russet in the cock and white in the hen.
THE INDIAN PADDY BIRD. (ARDEOLA GRAYII)THE INDIAN PADDY BIRD. (ARDEOLA GRAYII)
THE INDIAN PADDY BIRD. (ARDEOLA GRAYII)
In another nest containing a young koel (put there by me) and two crow’s eggs, I placed a paddy bird’s (Ardeola grayii) egg, hoping that the gallant crow would hatch it out and appreciate the many-sidedness of her family. She hatched out the egg all right, at least I believe she did. I saw it in the nest the day before the young paddy bird was due; but when I visited the nest the following morning neither egg nor young bird was there. It would seem that the crow did not appreciate the appearance of the latest addition to the family and destroyed it. It is, of course, possible that the young koel declined to associate with such a neighbour and killed it; but I think that the crow was the culprit, for I had previously placed a paddy bird nestling, four days old, in a crow’s nest containing only young crows, and the paddy bird had similarly disappeared.
These, then, are the main facts which my game of cuckoo has brought to light. They are not so decisive as I had expected. They seem to indicate that the actions of birds with eggs or young are not quite so mechanical as I had supposed. Were they not largely mechanical a crow would never hatch out a koel’s egg, nor would it feed the young koel when hatched out; itwould not incubate a fowl’s or a paddy bird’s egg, and it would assuredly decline to sit upon a golf ball. On the other hand, were the acts of nesting birds altogether mechanical, the young paddy birds would have been reared up, and the substitution of two golf balls for two eggs would not have been detected. There is apparently a limit to the extent to which intelligence is subservient to blind instinct.
Anglo-Indians frequently confound the koel with the brain-fever bird. There is certainly some excuse for the mistake, for both are cuckoos and both exceedingly noisy creatures; but the cry of the koel (Eudynamis honorata) bears to that of the brain-fever bird or hawk-cuckoo (Hierococcyx varius) much the same relation as the melody of the organ-grinder does to that of a full German band. Most men are willing to offer either the solitary Italian or the Teutonic gang a penny to go into the next street, but, if forced to choose between them, select the organ-grinder as the lesser of the two evils. In the same way, most people find the fluty note of the koel less obnoxious than the shriek of the hawk-cuckoo.
The latter utters a treble note, which sounds like “Brain fever.” This it is never tired of repeating. It commences low down the musical scale and then ascends higher and higher until you think the bird must burst. But it never does burst. When the top note is reached the exercise is repeated.
The koel is a bird of many cries. As it does not, like the brain-fever bird, talk English, its notes are not easy to reproduce on paper. Its commonest call is a crescendokuil, kuil, kuil, from which the bird derives itspopular name. This cry is peculiar to the cock. The second note is, to use the words of Colonel Cunningham, “an outrageous torrent of shouts, sounding likekūk, kŭū, kŭū, kŭū, kŭū, kŭū, repeated at brief intervals in tones loud enough to rouse the ‘Seven Sleepers.’” The koel is nothing if not impressive. He likes to utter this note just before dawn, when all the world is still. As the bird calls chiefly in the hot weather, when it frequently happens that the hour before sunrise is almost the only one in the twenty-four in which the jaded European can sleep, this note is productive of much evil language on the part of the aforesaid European.
The koel’s third cry is well described by Cunningham as a mere cataract of shrill shrieks—heekaree, karees. This is heard mostly when the hen is fleeing for dear life before a pair of outraged crows. So much for the voice of the koel, now for a description of the singer. The cock is a jet-black bird with a green bill and a red eye. The hen is speckled black and white, with the eye and beak as in the cock. Add to this the fact that the koel is a little larger than the “merry cuckoo, messenger of spring” which visits England, and it is impossible not to recognise the bird.
This cuckoo, like many of its relatives, does not hatch its own eggs. It cuckolds crows. This is no mean performance, for the crow is a suspicious creature. It knoweth full well the evil which is in its own heart, and so, judging others by itself, watches unceasingly over its nest from the time the first egg is deposited therein until the hour when the most backward young one is able to fly. Now, a koel is no match for a crow in openfight, hence it is quite useless for the former to attempt by means of force to introduce its egg into the crow’s nest. It is obliged to resort to guile. The cock entices away the crows, and while they are absent the hen deposits her egg.
Crows appear to dislike the cry of the koel quite as much as men do. But whereas man is usually content with swearing at the noisy cuckoo, crows attack it with beak and claw whenever an opportunity offers. This fact is turned to account by the koel. The cock alights in a tree near a crow’s nest and begins to call. The owners of the nest, sooner or later, “go for” him. He then takes to his wings, continuing to call, so as to induce the crows to prolong the chase. As he is a more rapid flier than they, he does not run much risk. While the irate corvi are in pursuit, the hen koel, who has been lurking around, slips into the nest and there lays her egg. If she is given time she destroys one or more of those already in the nest. She does this, not because the crows would detect the presence of an additional egg, but in order that her young, when hatched, will not be starved owing to the large number of mouths to feed.
Crows, although such clever birds, are, as we have seen, remarkably stupid at the nesting season. They are unable to distinguish the koel’s egg from their own, although the former is considerably smaller, with an olive-green background instead of a bluish one; and when the young koel emerges from the egg, they are unable to differentiate between it and their own offspring, although baby koels are black and baby crowspink, when first hatched out. The koel nestling has one point in common with young crows, and that is a large mouth of which the inside is red. This is opened wide whenever a parent approaches, so that the latter sees nothing but a number of yawning caverns; thus there is some excuse for its failure to distinguish between the true and the spurious nestlings.
To return to the koel who is laying her egg in the momentarily deserted nest. She does not carry her egg thither in her beak as the common cuckoo is said to do, but sits in the nest and lays it there. Sometimes the crows return before she is ready and, of course, attack her, but as she can fly faster than they, they do not often succeed in harming her, although there are instances on record of crows mobbing female koels to death. It will thus be seen that cuckolding crows is dangerous work. The life of the cuckoo is not all beer and skittles, and the birds seem to feel the danger of their existence, for at the breeding season they appear to be in a most excited state, and are manifestly afraid of the crows. This being so, I am inclined to think that the latter are responsible for the parasitic habit of the koel. It is not improbably a case of the biter bit. Crows are such aggressive birds that they are quite capable of evicting any other bird from its nest if this be large enough to suit their purpose. Now suppose a koel to be thus evicted by force when ready to lay; it is quite conceivable that she might make frantic efforts to lay in her rightful nest, and if she succeeded, and the crows failed to detect her egg, they would hatch out her offspring. If the koels which actedthus managed to have their offspring reared for them, while those that attempted to build fresh nests dropped their eggs before the new nurseries were ready, natural selection would tend to weed out the latter and thus the parasitic habit might arise, until eventually the koel came to forget how to build a nest.
In this connection it is important to bear in mind that the nearest relatives of the koel are non-parasitic. It is therefore not improbable that in the koel the parasitic habit has an independent origin.
This instinct has undoubtedly been evolved more than once. It does not necessarily follow that similar causes have led to its origin in each case.
The suggestion I have made is made only with reference to the koel, which differs from other cuckoos in that it dupes a bird stronger and bigger than itself. But this is a digression.
If the koel have time, she destroys one or more of the existing eggs, and will sometimes return later and destroy others. Although the crow cannot distinguish between her own and koel’s eggs, the koel can. I have come across several crows’ nests which each contained only two koel’s eggs.
The young koel is a better-behaved bird than some of its relations, for it ejects neither the eggs still in the nest when it is hatched nor its foster-brethren. But the incubating period of the koel is shorter than that of the crow, so that the koel’s egg is always the first to hatch out. The koel seems never to make the mistake of depositing its egg among nearly incubated ones. Thus the young koel commences life with a useful starton its foster-brethren. It soon increases this start, as it grows very fast, and is ready to fly before the earliest feathers of its foster-brothers are out of their sheaths.
It does not, however, leave its foster-parents when able to fly. It sits on the edge of the nest and makes laudable, if ludicrous, efforts at cawing. The crows continue feeding it long after it has left the nest, looking after it with the utmost solicitude. A young koel is somewhat lacking in intelligence; it seems unable to distinguish its foster-parents from any other crow, for it opens its mouth at the approach of every crow, evidently expecting to be fed.
The natives of the Punjab assert that the hen koel keeps her eye on the crow’s nest in which she has laid her egg or eggs during the whole of the time that the young cuckoo is in it, and takes charge of her babe after it leaves the nest. This assertion appears to be incorrect. I have never seen a koel feeding anything but itself. Moreover, the koel lays four or five eggs, and these are not usually all deposited in one nest. It would therefore be exceedingly difficult, if not impossible, for the hen to keep an eye on each of her eggs.
In view of the hatred which crows display towards koels in general, naturalists have expressed surprise that the young koels are not mobbed directly they leave the nest. Their plumage differs in no way from that of the adult. It has been suggested that young koels retain the crow smell for a considerable time after they are fledged. This I cannot accept. The olfactory organ of birds is but slightly developed. Indeed, I aminclined to wonder whether birds have any sense of smell. The truth of the matter is that crows look after their foster-children most carefully for several weeks after they have left the nest, and see that no strange crow harms them.