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Updated: June 3, 2025
When the spider has decided upon a location, which is always in clay, adobe or stiff soil, he excavates the shaft by means of the sharp horns at the end of his mandibles, which are his pick and shovel and mining tools. The earth is held between the mandibles and carried to the surface.
The Anthophora digs corridors and cells in the road-side banks hardened by the sun; she does not erect, she excavates; she does not build, she clears. Toiling away with her mandibles, atom by atom, she manages to contrive the passages and chambers necessary for her eggs; and a huge business it is. She has, in addition, to polish and glaze the rough sides of her tunnels.
The smallest leguminous seed, if barely bigger than a pin's head, nourishes its weevil; a dwarf which patiently nibbles it and excavates a dwelling; but the plump, delicious haricot is spared. This astonishing immunity can have only one explanation: like the potato and the maize-plant, the haricot is a gift of the New World.
The Scolia does not bore the soil through which she passes: she excavates and ploughs it with her legs and forehead; and the stuff shifted remains where it lies, behind her, forthwith blocking the passage which she has followed.
The ambuscade of the Ant-lion is classic; it does not differ greatly from the others. He excavates a conical pitfall, in which he conceals himself, and seizes the unfortunate ants and other insects whom ill-chance causes to roll into it. See e.g. Tennent, Ceylon, vol. i. p. 252. Also Réaumur, Mémoires pour d'histoire des Insectes, t. i. p. 14, and t. vi. p. 333. The baited ambush.
The current of a stream follows the outer side of all curves or bends in the channel, and on this side it excavates its bed the deepest and continually wears and saps its banks. On the inner side deposition takes place in the more shallow and slower-moving water. The inner bank of bends is thus built out while the outer bank is worn away.
That Brahmana who excavates a tank, and he that plants trees, and he that performs sacrifices, are all worshipped in heaven even as men that are devoted to truthfulness of speech. Hence one should cause tanks to be excavated and trees to be planted, worship the deities in diverse sacrifices, and speak the truth.""
Like all people possessed by one idea, these ladies press everything into the service of their great project, slowly elaborating their toils, much as the ant-lion excavates its funnel in the sand and lies in wait at the bottom for its victim. Suppose that no one strays, after all, into that carefully constructed labyrinth? Suppose that the ant-lion dies of hunger and thirst in her pit?
The wasp lays its solitary egg at the extremity of a hole it excavates for itself on a bare hard piece of ground, and many holes are usually found close together. When the grub for I have never been able to find more than one in a hole has come out from the egg, the parent begins to bring in insects, carefully filling up the mouth of the hole with loose earth after every visit.
The insect bends his head a long way down and, with the points of his mandibles, brought together to form a pick-axe, he hews, digs and excavates with a will. The fore-legs, spread out and armed with hooks, gather the dust and rubbish into a load which is thrust backwards. In this way, a mound rises on the threshold of the burrow.
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