The Crateropus babblers, known variously as the Sath Bhai, seven sisters, or dirt birds, furnish perfect examples of communal life. So highly developed are their social instincts that a solitary babbler, or even a pair, is a very unusual sight. They do not congregate in large flocks; from six to fourteen usually constitute a brotherhood, eight, nine, or ten being, perhaps, the commonest numbers. There is no truth in the popular idea that they always go about in flocks of seven. Sir Edwin Arnold recognised this when he wrote of “the nine brown sisters chattering in the thorn.”

Notwithstanding the fact that babblers are among the commonest birds in India, there is much to be discovered regarding the nature of their flocks. The raison d’Étre of these flocks is not far to seek. One has but to observe the laboured flight of a babbler to appreciate how easy a mark he is to a bird of prey. The strength of the babbler lies in his clan. Eight or ten pairs of eyes are superior to one. A party of seven sisters is not often caught napping. The incessant squeaking, and screeching, and wheezing indulged in by each member keep them all in touch with one another. Then, in time of danger, it is good to see how they combine to drive off the hawk-cuckoo (Hierococcyx varius) which victimises them, and which they undoubtedly mistake for a species of raptorial bird.

But their clannishness does not shelter them from all tribulation. They are the dupes of the hawk-cuckoo, and they sometimes fall victims to birds of prey. A few weeks ago I had occasion to visit a friend, who was unwell and confined to his bungalow. I found him sitting in the verandah. While greeting him I heard a great clamour of scolding babblers (Crateropus canorus) emanating from a neem tree hard by. I had come just too late to witness a little jungle tragedy. There was a babbler’s nest containing young in that tree. A pair of rascally crows had discovered the nest, and one of them attacked it; the babbler in charge, with splendid courage, went out to meet his big antagonist, who promptly turned tail and fled, pursued by the screeching babbler. This left the nest open to the other crow, who carried off a young bird. When I arrived, the victims of the outrage were swearing as only babblers and bargees can, and making feints at the crows.

It is thus obvious why these clubs, or brotherhoods, have been formed, but we are almost altogether in the dark as to how they are formed, as to their nature and constitution. We do not even know what it is that keeps them apparently so constant in size. It is even a disputed point whether these little companies persist throughout the year, or disband at the nesting season. As to the nature of the companies, Colonel Cunningham maintains that they are family parties. This view is, however, untenable, unless we assume that the seven sisters are polygamists or polyandrists, because three or four is the normal number of eggs laid, so that if each little gathering were a family party, it should consist of not more than six members. The flocks are too large to be made up of mother, father, and children, and usually too small to be two such families.

There is at present living in the compound of the Allahabad Club a company consisting of, I think, eight babblers. Seven are adults, and one is quite a child. This last goes about with its elders, every now and again flapping its wings, opening wide its yellow mouth, and calling for food. A day or two ago it took up a position within a few feet of my door, so that I was able to watch it closely through the chik. I saw one of the company come up with a grub in its bill, which it, with due ceremony, put into the young bird’s “yellow lane.” Having fed the youngster, it began rummaging about in the grass near by. Shortly afterwards a second babbler came up to the young one, bringing a caterpillar. This particular individual carried his (or her, for I don’t pretend to be able to sex a babbler at sight) tail askew. That organ protruded from under the left wing, instead of projecting between the wings, as is usual with tails—babblers, like actors and artists, affect a careless style of dress. Having delivered up its caterpillar to the clamorous youngster, it hopped away. I kept my eye carefully upon both it and the bird I had first seen bring food. In a few seconds a third babbler came up and presented a caterpillar to the baby brown sister. Now, I submit that this can only mean that babblers are not monogamous, or that they nest in common sometimes, or, so close are the ties that bind the members of the little company that each feeds both his own offspring and those of his brethren. Personally, I am inclined to think that babblers are monogamous. That the same nest is sometimes used by more than one pair seems to be established by the fact that there are cases on record of nests containing as many as eight eggs, or young ones. This, however, is not a usual occurrence, and it is my belief that the members of the club are so greatly attached to one another that they look upon each infant as common property. Hume quotes Mr. A. Anderson as saying: “During the months of September and October I have observed several babblers in the act of feeding one young Hierococcyx varius (the brain-fever bird or hawk-cuckoo, which, as we have seen, is parasitic on babblers) following the bird from tree to tree, and being most assiduous in their attentions to the young interloper.” This observation, I submit, supports the view that each member of the flock takes a personal interest in the offspring of other members, even though it be spurious!

Thus we may take it that these gatherings are not family parties, but rather of the nature of clubs. The question, then, arises: What determines the membership of these clubs? At present our knowledge of the ways of these common birds is not sufficient to enable us to frame a satisfactory reply. It is even an open question whether or not these clubs break up at the breeding season, or whether the nesting birds still continue to seek food in company. Colonel Cunningham declares that during April and May babblers “cease to go about in parties, and pairs of them are everywhere busily occupied in nesting.” Jerdon, on the other hand, states that the parties persist throughout the breeding season. I feel sure that Jerdon is right. No matter where one is stationed, parties of babblers are to be seen at all seasons of the year. From this, of course, it does not necessarily follow that the nesting birds do not forsake their brethren, at any rate for a time. It is probable, nay certain, that all the members of a flock do not pair and nest simultaneously. The breeding season extends at least from March to July. But the fact that there is quite a baby bird in the babbler brotherhood that dwells in the compound of the Allahabad Club seems to indicate that the nesting birds continue to find their food in company. There is no reason why they should not, for babblers neither migrate nor wander far afield.

But the question arises: What happens to the young birds when they are grown up? If they attached themselves to the existing flocks, these would tend to increase in size, and sometimes, at any rate, we should see an enormous assembly. So far as one’s casual observation goes, the flocks keep constant in number throughout the year. It is, of course, quite possible that casual observation leads one astray in this case. Any person interested in the subject, who has a more or less fixed abode, would do some service to ornithology if he would make a point of looking out for babbler clubs, and endeavouring to count the members of each, and keep a record of the results, with the date of each census. I am aware that it is not easy to count accurately a babbler club, for its members are always on the move, and odd birds are apt to pop out of unexpected places. But even rough figures, if they extended to a number of flocks, would, being all liable to the same error, prove fairly accurate as regards averages. Such observations, if they were to extend over a year, might lead to some interesting results. They would almost certainly show a reduction of numbers during the summer months, when nesting operations were in progress, but would this be followed by a considerable rise later in the year? If so, it would seem to indicate that some, at any rate, of the young ones attached themselves permanently to the flock in which they were born.

A somewhat more elaborate experiment which might yield interesting results would be to trap a whole “school” of babblers; they might be captured while asleep. After a piece of coloured material had been tied round the leg of each, every bird being decorated by a different colour, the irate sisters would be restored to liberty. Then it might be possible to follow the fortunes of each separate bird, and learn whether a given flock is always made up of the same individuals, whether they practise exogamy or favour endogamy, and a hundred and one other interesting facts relating to the vie intime of the brown sisters. I use the word “might” advisedly. For alas! bitter experience has taught me that, more often than not, the most cunningly devised ornithological experiments yield no definite results. It is quite possible that the club of babblers thus captured and decorated with gay colours might flee from the neighbourhood in wrath and terror. The birds would not understand the why and the wherefore of the proceeding, and might, perhaps, think that you were going to make a practice of catching them every night and tying things round their limbs. A bird whose leg has been pulled once is apt to be twice shy.