Burrowing

“ When he fails to find his food by burrowing under ground, he comes up to look for it on the surface. Meeting with a morsel to his taste, he takes it home when its size permits; if not, he leaves it on the threshold of his burrow and gnaws at it from below, without reappearing outside. ”

“ And now if we turn to the rodents for rivals to the mole, we are almost confounded by the multitude of creatures which have found safety in burrowing. Not only have we the rabbit-warrens, by which the sandy soil of our commons is riddled in every direction with holes, leading to burrows where the mother lies snugly hidden with her five or six naked little ones in a bed of her own fur; but we have the extensive burrows of the little, long-legged, leaping, gnawing Jerboas of Africa, which are so like the Jumping Shrews among insect-eaters. ”

“ Burrowing into the ground, they cast up the earth they have swallowed, and so pursue a constant and thorough system of ploughing. Though eyeless, they evade the light and only come out of their burrows at dusk, often remaining, even then, with their tails in the holes and their bodies working round and round. ”

“ Here, too, there is a great variety, some of them building the paper nests known to every one, others burrowing into the surface of the ground and storing up in these burrows grasshoppers and other insects for food for their young which are grub-like in form; others still burrowing into the twigs of bushes, and others making mud nests attached to the trunks of trees or to the clapboards of houses or outbuildings. ”

“ By these it was enabled to supply itself with food, like that bird, in muddy places, or on the banks of the lakes, in which its webbed feet enabled it to swim; while on shore its long and sharp claws were employed in burrowing; nature thus providing for it in its double or amphibious character. ”

“ How still the woods seem from here, yet how lively a stir the hidden animals are making; digging, gnawing, biting, eyes shining, at work and play, getting food, rearing young, roving through the underbrush, climbing the rocks, wading solitary marshes, tracing the banks of the lakes and streams! Insect swarms are dancing in the sunbeams, burrowing in the ground, diving, swimming,—a cloud of witnesses telling Nature’s joy. ”

“ In digging out one of the burrowing animals, the black hunter pushes a long and flexible stick down the hole, draws it out, measures along the ground to the spot exactly above the end of the burrow, replaces the stick, and digs down upon it. ”

“ Once the burrow has attained a depth of a couple of inches, it forms a sufficient shelter for the needs of the moment. The rest will be the work of time; a labour resumed at will, for a short time daily. The burrow will be made deeper and wider as the growth of the inmate and the inclemency of the season demand. Even in winter, if the weather is mild, and the sun smiles upon the threshold of his dwelling, one may sometimes surprise the Cricket thrusting out small quantities of loosened earth, a sign of enlargement and of further burrowing. ”

“ It is emphatically a burrowing animal, living literally in the mud, into which it scoops or gouges its way with great facility. In the burrowing operation the forward edge of the anterior shield is pressed downward and shoved forward, the two shields being inflected, and the sharp point of the tail presenting the fulcrum as it pierces the mud, whilst underneath the feet are incessantly active scratching up and pushing out the earth on both sides. ”

“ He spends his time in burrowing, not so much for shelter and concealment, as to supply himself with roots. He digs with great ease and rapidity, making a hole large enough for a man’s arm to be inserted. ”

“ There are burrowing amphibians, burrowing reptiles, burrowing birds, and burrowing mammals; there are tree-toads, tree-snakes, tree-lizards, tree-kangaroos, tree-sloths, tree-shrews, tree-mice, tree-porcupines, and so on; enough of a list to show, without mentioning birds, how many different kinds of animals have entered upon an arboreal apprenticeship--an apprenticeship often with far-reaching consequences. ”

“ They found that the burrowing host, driven out of their former homes either by an unlooked-for seepage or the advent of a stronger animal, had been attracted to the field because the harrow had so recently broken and softened the fallow, and had dug so rapidly since the planting of a few weeks before, that the north end, perforated every three or four feet, would be utterly useless, that year at least, for either the harvester or the plow. ”

“ In forming their burrows, or in the pursuit of other burrowing animals, these creatures often penetrate through the whole or greater portion of the soil-covering. The material which is withdrawn from the burrow is accumulated about its mouth. The result is the overturning of a considerable amount of the earth, and a consequent commingling of the material with vegetable matter. When brought to the surface and left exposed to the action of frost, the breaking up of the material is greatly favored, and thus the formation of the soil is facilitated. ”

“ Venus, Donax, Tellina, Mactra, which are shallow burrowers, do not gape; Solen, Lutraria, and to a less degree Mya, burrow deeply and gape widely. In order to burrow deeply the foot must be highly developed, and the larger it becomes, the more will it tend to keep the valves apart at the place where it is habitually protruded. Burrowing species always remain in communication with the surface by means of their siphons, the constant extension of which tends to keep the valves apart at the end opposite to the foot. ”

“ Then, backing in herself, she catches it in her mandibles and drags it out of sight, leaving us full of admiration and delight.
How clear and accurate must be the observing powers of these wonderful little creatures! Every patch of ground must, for them, have its own character; a pebble here, a larger stone there, a trifling tuft of grass—these must be their landmarks. And the wonder of it is that their interest in each nest is so temporary. A burrow is dug, provisioned and closed up, all in two or three days, and then another is made in a new place with everything to learn over again. ”

“ In the midst of what we regard as storm-beaten desolation he pipes and whistles right cheerily, and enjoys long life in his skyland homes. His burrow is made in disintegrated rocks or beneath large boulders. Coming out of his den in the cold hoarfrost mornings, he takes a sun-bath on some favorite flat-topped rock, then goes to breakfast in garden hollows, eats grass and flowers until comfortably swollen, then goes a-visiting to fight and play. How long a woodchuck lives in this bracing air I don’t know, but some of them are rusty and gray like lichen-covered boulders. ”

“ I think that after the winter has passed, and while the marsh is still covered with water, impregnation takes place and burrows are immediately begun. I do not believe that the same burrow is occupied for more than one year, as it would probably fill up during the winter. At first it burrows diagonally, and as long as the mouth is covered with water is satisfied with this oblique hole. When the water recedes, leaving the opening uncovered, the burrow must be dug deeper, and the economy of a perpendicular burrow must immediately suggest itself. ”

“ Each burrow is a bewildering labyrinth of galleries and tunnels, and in attempting to lay bare an interior the loose sand caved in, and the little sprite that lived there either escaped at a distant point or was lost in the shuffle of sand. ”

“ They all live in tunnels in the ground, which they dig by means of their fangs; and as they do not want the situation of their nest to be discovered, they carry the earth away to a little distance as fast as they dig it up, and carefully hide it. Very often the hole which they dig in this way is eighteen inches or two feet deep. And at the bottom it always turns sideways for an inch or two, so that the general shape of the burrow is very much like that of a stocking. ”

“ These little animals burrow deeply in the ground, and the method of dislodging them adopted by us was the pouring a quantity of water into their holes, which causes them to rush out at another aperture, when they commence leaping about in a surprising manner until they observe another burrow and instantly disappear. If chased, they spring from the hind quarters, darting about here and there, and affording great amusement to the pursuers. ”

“ These animals associate in large companies, occupying with their burrows sometimes two hundred acres of land. The burrows are separate, and each contains ten or twelve of these inhabitants. There is a little mound in front of the hole, formed of the earth thrown out of the burrow; and frequently there are three or four distinct holes, forming one burrow, with their entrances around the base of a mound. These mounds, about two feet in height and four in diameter, are occupied as watch-towers by the inhabitants of these little communities. ”

“ The size of these curious little animals is not far from that of a very large rat, and they are not unlike in their appearance. As I have said, their burrows, are uniformly built in a lonely desert; and away, both from the proximity of timber and water. Each individual, or each family, dig their hole in the prairie to the depth of eight or ten feet, throwing up the dirt from each excavation, in a little pile, in the form of a cone, which forms the only elevation for them to ascend; where they sit, to bark and chatter when an enemy is approaching their village. ”

“ It lives in perpendicular burrows, feeding upon those insects which come within its reach. Its usual position is at the upper part of the burrow, with its jaws widely extended, so as to snap up any insect that may venture too near.
When it has secured its prey, it seeks the bottom of its burrow, makes its meal in quiet, and reascends. How it does so we shall soon see. Towards the end of the body, one of the segments is much enlarged, and has a bold prominence upon the back. On the summit of this prominence there are two horn-like hooks, shaped as seen in the illustration. ”

“ You would think, perhaps, that when a lug worm bores its way through the loose sand, the sides of its burrow would fall in behind it as fast as it passed along. But from the surface of its body it pours out a thin, sticky liquid which binds the sand together, and forms a kind of lining to the burrow, like the brickwork of a railway tunnel. The burrow is generally about two feet deep, and the worm always lives in it with its head downwards. The worm itself, when fully grown, is from six to ten inches long. ”

“ Among the great variety of burrows formed in the grass, or under the surface of the soil, by various animals and insects, there is one that I have often anxiously and, as yet, fruitlessly explored. This burrow is formed by the smallest quadruped animal known to man, the minute shrew, which, when full grown, rarely exceeds the weight of thirty-six grains. ”

“ The burrow was not empty when he came to it, for it already contained two moorhens' eggs; but there was still room for more, and one by one he fetched the remainder of his victims, mother and all, that way, and stuffed them into the burrow, with a plodding, steady, exact doggedness of purpose that was rather surprising in a mere wild beast who, if seen casually, would have appeared to the ordinary man to be merely aimlessly wandering about the landscape. ”

“ I could see hardly anything—only the light from the burrow-mouth, lighting up the sides of the burrow for a yard or two, and a sort of gleam, a sort of shining wetness, upon the floor of the shaft and on its outer wall. ”

“ It catches its prey and ordinarily acts like a rather dull flycatcher, perching on some dead tree, swooping on insects and then returning to its perch, and never going on the ground to feed or run about. But it nests in burrows which it digs itself, one bird usually digging, while the other bird perches in a bush near by. Sometimes these burrows are in the side of a sand-bank, the sand being so loose that it is a marvel that it does not cave in. Sometimes the burrows are in the level plain, running down about three feet, and then rising at an angle. ”

“ A few days before bringing forth they dig a fresh burrow, not in a straight line, but in a crooked direction, at the bottom of which they make an excavation; after which they tear a quantity of hair from off their bellies, and with it make a bed for their little ones. For the first two days they never quit them; they never stir abroad but when forced by hunger, and then return as soon as they have satisfied their appetite, which they do amazingly quick. ”

“ When he is safely out of the way dig carefully down with a knife or trowel so as to examine the hole or "burrow." At the top you generally find it lined with pieces of grass or leaves that the worm has pulled in; lower down the lining comes to an end, but the colour of the burrow is redder than that of the rest of the soil wherever the soil has a greenish tinge. These holes are useful because they let air and water down into the soil. ”

“ When so much earth has been forced out of one opening that expulsion of additional loads of earth is overly difficult, the burrow is extended slightly to one side, or even extended into the newly formed mound, and another fan formed. ”