According to our old works on husbandry, we have many prognostics of rain from the motions of animals. One of them observes thus: “In a herd of cows, as they are on their march towards their pastures in a morning, if the bull lead the van, and keep back his company that they go not before him, it is a prognostic of rainy or tempestuous weather; but if he be careless and let them go at random, the contrary. Or if they eat more than ordinary, or lick their hoofs all about, rain follows forthwith. If they run to and fro, flinging and kicking, and extending their tails, tempests usually follow.”[110]
The same writer says that, “If the swallow fly low, and near the waters, it presageth rain: the coming of the swallow is a true presage of the spring.” It has been [already] remarked, that the 15th of April, from the usual appearance of this remarkable bird about that time, is called “swallow-day.”
The Swallow.
The Swallow.
The preceding [engraving] is copied from one which illustrates a scientific and agreeable investigation concerning the harbinger of spring, by Dr. Forster; from which dissertation the following interesting particulars are also derived.[111]
The swallow makes its first appearance in Great Britain, early in spring; remains with us during summer, and disappears in autumn. The four species which inhabit this island, are also found during summer, in almost every other region in Europe and Asia, where their manners and habits are nearly the same as in this country. In the more southern parts of the Continent, they appear somewhat earlier than in England. The distinguishing marks of the swallow tribe are—a small bill; a wide mouth; a head rather large in proportion to the bulk of the body, and somewhat flattish; a neck scarcely visible; a short, broad, and cloven tongue; a tail mostly forked; short legs; very long wings; a rapid and continued flight.
The house or Chimney Swallow, hirundo rustica, (figured [above]) is the most common, as well as the best known. Its length is about six inches, its breadth from tip to tip of the wings, when extended, about twelve inches; the upper parts of its body and wings are black; the under parts whitish ash-colour; the head black; the forehead and chin marked with a red spot; the tail very much forked. It generally arrives earlier than the rest of its genus, and mostly before the middle of April. It builds its nest in chimnies, at the distance of about a foot from the top, or under the roofs of barns and outhouses, has commonly two broods in the year, and usually disappears in the latter end of September, or beginning of October. Like all birds of the swallow tribe, it is perpetually on the wing, and lives upon insects, which it catches flying. It has been calculated from the velocity of this bird on the wing, and its flight in the air for fourteen or fifteen hours together, in search of food, that it flies from two to three hundred miles in that time. As previously observed by an early writer, before rain it may often be seen skimming round the edge of a lake or river, and not unfrequently dipping the tips of its wings, or under part of its body into the water, as it passes over its surface. Dr. Forster cites Aratus and Virgil in corroboration, that ancient authors had observed the same fact. He describes the Martin, or Martlett, hirundo urbica, as being rather less than the swallow, and as easily distinguishable from it, by the bright white colour of all the under parts of the body. This species usually makes its first appearance early in May, though sometimes sooner, and leaves us towards the latter end of October. It builds under the eaves of houses, in crags of rocks and precipices near the sea, has oftentimes three broods in the year, and constructs its curious nest like that of the swallow, with mud and straw, lined with feathers on the inside. He says that the Swift, hirundo apus, is the largest of the genus, being seven inches in length, and nearly eighteen in breadth, when its wings are extended, and that it is of a sooty black colour, with a whitish spot on its breast. It arrives towards the middle of May, and departs about the middle of August. It builds in holes of rocks, in ruined towers, and under the tiling of houses; and has only one brood in the year. He observes of the Bank or Sand Martin, hirundo riparia, that it is the smallest of the genus, is of a dusky brown colour above, and whitish beneath; and that it builds its nest in holes, which it bores in banks of sand, and is said to have only one brood in the year.
No subject has more engaged the attention of naturalists, in all ages, than the brumal retreat of the swallow; neither is there any subject on which more various and contrary opinions have been entertained. Some have supposed that they retire at the approach of winter to the inmost recesses of rocks and mountains, and that they there remain in a torpid state until spring. Others have conjectured that these birds immerse themselves in the water at the approach of winter, and that they remain at the bottom in a state of torpidity, until they are again called forth by the influence of the vernal sun. Dr. Forster admits that there are several instances on record of their having been found in such situations, clustered together in great numbers, and that, on being brought before the fire, they have revived and flown away. But he thinks that few of the accounts were well authenticated; and that the celebrated John Hunter and Mr. Pearson clearly prove, from various experiments, that these birds cannot continue long under water without being drowned. The doctor does not deny that swallows have occasionally been found under water; but he attributes their having been found in such situations to mere accident. As it is well known that, towards the latter end of autumn, swallows frequently roost by the sides of lakes and rivers; he therefore supposes that a number of these birds had retired to roost on the banks of some shallow and muddy river at low tide; that they had been induced by the cold to creep among the reeds or rushes which might grow in the shallow parts of the river, and that while in that situation, driven into a state of torpidity by the cold, they had been overwhelmed, and perhaps washed into the current, by the coming in of the tide. He alludes to occasional instances of other birds besides swallows having been found in a state of torpor during winter, and imagines that fishermen had availed themselves of the coming in of the tide to catch fish, and that the swallows, before supposed to have been carried into the current, coming in contact with their nets, were consequently drawn out by them, and, not having been long under water, were not completely drowned. There are several circumstances which seem to favour the opinion, that these birds remain concealed during winter in this country. Among others, the most striking is, that swallows, hirundines rusticae, as well as martins, hirundines urbicae, have sometimes appeared very late in autumn, a considerable time after they were all supposed to have taken their departure; and that they have likewise been found concealed in the crevices of rocks, in holes of old decayed trees, in old ruined towers, and under the thatch of houses. Dr. Forster further presumes, that those birds, which have been found in a state of torpidity, had, owing to some accident, been hatched later in the year than ordinary, and consequently had not acquired sufficient strength to undergo the fatigue of a long journey upon the wing, at the time when the migration of the rest of their species took place; and that to shelter themselves from the inclemency of the weather, they had sought retreats wherein, from cold and hunger, they had sunk into a state of torpidity. “For several years past,” says Dr. Forster, “I have observed that chimney swallows have appeared first in cold weather. I have sometimes seen them as early as April the 2d, when the mercury in the thermometer has been below the freezing point. On the other hand, I have often taken notice, that during a continuance of mild weather for the space of a fortnight, in the month of April, not so much as one swallow has appeared.” He remarks, that towards the latter end of September, swallows, as well as martins, congregate in great numbers, and are frequently seen sitting on the tops of houses, and on rocks near the sea. These meetings usually continue for several days, after which they suddenly disappear. They seldom perch on trees, except in autumn, shortly previous to their disappearance, and they then choose dead trees in preference. They sometimes sit on trees earlier in summer, when the weather has been very cold.
Swifts begin to assemble in large bodies previous to their departure, early in July: their numbers daily increase, and they soar higher in the air, with shriller cries, and fly differently from their usual mode. Such meetings continue till towards the middle of August, after which they are seldom seen. Sand martins likewise flock together in autumn. Some years ago they appeared in great numbers in London and its neighbourhood. Dr. Forster clearly shows that swallows are birds of passage, and produces the accounts of mariners, who had seen these birds many hundred miles out at sea, and on whose ships they had alighted to rest, almost exhausted with fatigue and hunger. By this means we may be enabled, in some measure, to determine to what quarter of the globe they retire, when they leave Europe in autumn. Adanson, in his “Voyage to Senegal,” relates, that on the 6th of October, being about fifty leagues from the coast, between the island of Goree and Senegal, four swallows alighted on the shrouds of his ship, which he easily caught, and knew to be European swallows. He adds, that they never appear at Senegal, until the winter season, and that they do not build nests as in Europe, but roost every night on the sand by the sea shore. Sir Charles Wager, first lord of the admiralty, relates, that in one of his voyages home, as he came into soundings of our channel, a great flock of swallows settled on his rigging: every rope was covered with them: they hung on one another like a swarm of bees: the decks and carvings were filled with them: they seemed spent and famished, and, to use his own expression, were only feathers and bones; but, recruited with a night’s rest, they resumed their flight in the morning. A similar circumstance happened to captain Wright, in a voyage from Philadelphia to London.