But life is a whole, and all conduct is good whose actions realize an object and are adapted to an end. If there is a "spirit" of the hive, the insect also has its morality and the wasp's nest its "law," and the conduct of its inmates, horrible though it may seem to Fabre, is doubtless only a submission to certain exigencies of that universal law which makes nature a "savage foster-mother who knows nothing of pity."
These cruelties particularly show us that one of the functions of the insect in nature is to preside over the disappearance and also the ultimate metamorphoses of the least "remnants of life."
Each has its providential hygienic function.
The Necrophori, "the first of the tiny scavengers of the fields," bury corpses in order to establish their progeny in them; in the space of a few hours an enormous body, a mole, a water-rat, or an adder, will completely disappear, buried under the earth.
The Onthophagi purify the soil, "dividing all filth into tiny crumbs, ridding the earth of its defilements."
A very small beetle, the Trox, has the imprescriptible mission of purging the earth of the rabbits' fur rejected by the fox. [(10/5.)]
Here structure explains the function.
The intestine of the grub of the rose-beetle "is a veritable triturating mill, which transforms vegetable matter into mould; in a month it will digest a volume of matter equal to several thousand times the initial volume of the grub."
The intestine of the Scarabaei is prolonged to a prodigious length in order to "drain the excrement to the last atom in its manifold circuits. The sheep has finely divided the vegetable matter; the grub, that incomparable triturator, reduces it to the finest possible consistency; not a morsel is left in which the magnifying glass can reveal a fibre."
To fulfil its hygienic mission the insect arrives in due season, and multiplies its legions; "there are twenty thousand eggs in the flanks of the house fly; immediately they are hatched these twenty thousand maggots set to work, so that Linnaeus has said that three flies would suffice to devour the body of a horse or a lion."