The swallow lays from four to six white eggs, dotted with red specks; and brings out her first brood about the last week in June, or the first week in July. The progressive method by which the young are introduced into life is very amusing: first they emerge from the shaft with difficulty enough, and often fall down into the rooms below; for a day or so they are fed on the chimney-top, and then are conducted to the dead leafless bough of some tree, where, sitting in a row, they are attended with great assiduity, and may then be called perchers. In a day or two more they become fliers, but are still unable to take their own food; therefore they play about near the place where the dams are hawking for flies: and when a mouthful is collected, at a certain signal given, the dam and the nestling advance, rising toward each other, and meeting at an angle; the young one all the while uttering such a little quick note of gratitude and complacency, that a person must have paid very little regard for the wonders of nature that has not often remarked this feat.
The dam betakes herself immediately to the business of a second brood as soon as she is disengaged from her first, which at once associates with the first broods of house-martins, and with them congregates, clustering on sunny roofs, towers and trees. This hirundo brings out her second brood toward the middle and end of August.
All summer long, the swallow is a most instructive pattern of unwearied industry and affection: for from morning to night, while there is a family to be supported, she spends the whole day in skimming close to the ground, and exerting the most sudden turns and quick evolutions. Avenues, and long walks under the hedges, and pasture-fields, and mown meadows where cattle graze, are her delight, especially if there are trees interspersed; because in such spots insects most abound. When a fly is taken, a smart snap from her bill is heard, resembling the noise at the shutting of a watch-case; but the motion of the mandibles is too quick for the eye.
The swallow, probably the male bird, is the excubitor to house-martins and other little birds; announcing the approach of birds of prey. For as soon as a hawk appears, with a shrill alarming note he calls all the swallows and martins about him; who pursue in a body, and buffet and strike their enemy till they have driven him from the village; darting down from above on his back, and rising in a perpendicular line in perfect security. This bird will also sound the alarm, and strike at cats when they climb on the roofs of houses, or otherwise approach the nest. Each species of hirundo drinks as it flies along, sipping the surface of the water; but the swallow alone in general washes on the wing, by dropping into a pool for many times together: in very hot weather house-martins and bank-martins also dip and wash a little.
The swallow is a delicate songster, and in soft sunny weather sings both perching and flying; on trees in a kind of concert, and on chimney-tops: it is also a bold flier, ranging to distant downs and commons even in windy weather, which the other species seems much to dislike; nay, even frequenting exposed seaport towns, and making little excursions over the salt water. Horsemen on the wide downs are often closely attended by a little party of swallows for miles together, which plays before and behind them, sweeping around and collecting all the skulking insects that are roused by the trampling of the horses' feet: when the wind blows hard, without this expedient, they are often forced to settle to pick up their lurking prey....
A certain swallow built for two years together on the handles of a pair of garden shears that were stuck up against the boards in an outhouse, and therefore must have her nest spoiled whenever that implement was wanted; and what is stranger still, another bird of the same species built its nest on the wings and body of an owl that happened by accident to hang dead and dry from the rafter of a barn. This owl, with the nest on its wings, and with eggs in the nest, was brought as a curiosity worthy of the most elegant private museum in Great Britain.
FOOTNOTES:
[45] From "The Natural History of Selborne," being a letter to the Hon. Daines Barrington.