These principles apply chiefly to those species which remain with us during summer and winter alike, and which are useful to agriculture. But the international protection of birds is important as regards those useful species that are migratory, and, as they migrate, pass through countries where—as is the case in Italy—the birds are caught en masse, and where bird-catching is carried on as a trade.
The third international Ornithological Congress, held in Paris in 1900, decided that the Governments of the various European States should be called upon to have the food of birds made the object of special investigations, and to report the result, within a space of five years. When the fourth International Congress met, however, only Hungary and Belgium were able to report on the subject.
The publications of the Hungarian Ornithological Centre are founded upon the collection of data, divided into two main groups:—1. The Migration data, so-called historical, up to 1891, and again from that to the present day. 2. Foreign data, partly taken from literature, and Special data relating to one species, from the whole area of its habitation—the Cuckoo for instance.
The investigation of the economic rôle played by the Rook (Corvus frugilegus L.), which English landowners and farmers are beginning to feel is a matter of great importance, was begun by the Central Bureau in 1893; it is still going on. According to the results hitherto attained, this bird does more good by destroying insects, and in particular the larvæ of insects living underground, than it does harm to the crops.
It is our endeavour in this little volume which we now offer to English readers, to give a faithful presentment of the good and the harm that the birds are known to do, from the agriculturist’s standpoint. But in this all depends on the attitude which the gardener and the farmer adopt towards the birds.
By throwing a single stone a lad can scare away a whole flock of rooks; and when these birds alight on a field where they do harm to grain, a man must not grudge a little labour in keeping them off; considering that the same bird that works harm at one season, will be a valuable ally at another, as well as a source of pleasure and interest.
The rook, the crow, and even the mischievous magpie, follow the plough as it turns up the brown furrows, with sharp eyes spying worms, larvæ and cockchafer grubs. Nothing escapes the attention of the bird. He picks here and there, and fills his crop with the worst enemies of the tiller of the fields—the various forms of insect life that lie dormant in the earth until the time arrives for each one to come forth and fulfil its life’s mission—much of which means injury to the fruit of man’s labour.
Starlings rise in flocks—a perfect cloud of them—to disperse, and again to assemble before settling on the pastures, where they will be busy all the day, for that part of the year when man needs their services most.
Later, in the cherry trees and among our own vines the starlings would do mischief enough. The rifled branches and stripped grape stems are a sorry sight for the owner, who finds it hard to remember that God cares even for the sparrows. He tries to drive the thieves away, but they care little for the cries of the lads set to scare them. Little do they heed the rattles, feathers, rows of sticks with lines of thread—all the various flimsy inventions are useless; a gun will disperse them for the moment, but the cloud of pilferers is soon back again, and as busy as ever. At this juncture severe measures are justified. Even the most ardent bird-lover will not be foolish enough to protect every bird at all times and seasons. Yet it is only for a short season of the year that starlings are harmful, and for the greater part they are useful, in garden, field and meadow, from early morning until late evening, protecting growing blades of grass and coming seed and roots for the farmer, with unceasing labour. This is in the early spring; later they betake themselves to the pasture lands, where, on bright sunny mornings, they walk nimbly among the browsing cattle seeking their food in the form of crane fly and daddy-long-legs, in the shadow of the patient creatures. The gadflies, too, buzz about the bodies of the beasts, lay their eggs under the hide, boring into the flesh, tormenting and maddening the helpless cattle. The Hungarian herdsman is glad when he sees the starlings settle on his wide pastures.
When the eggs have developed into maggots the birds alight on the backs of the beasts, to rid them of gadflies and batflies; and the cattle and sheep suffer their services gladly, knowing well that these good feathered friends will effectually extract their torturers without further irritation to the infested parts. A horse has been known to die from the exhaustion caused by the continuous action of parasitic creatures.