One must live, and "the intestine rules the world."
All creatures that fill the world are incessantly conflicting, and one lives only at the cost of another.
On the other hand, in order that the coming generations may see the light, the present generations must think of the preservation of the young. "Perish all the rest provided the brood flourish!" And in the depth of burrows the future larvae who live only for their stomachs, "little ogres, greedy of living flesh," must have their prey.
To hunger and maternity let us also add love, which "rules the world by conflict."
Such are the components of the "struggle for existence," such as Fabre has described it, but with no other motive than to describe what he has observed and seen. Such are the ordinary themes of the grandiose battles which he has scattered through his narratives, and never did circus or arena offer more thrilling spectacles; no jungle ever hid more moving combats in its thickets."
"Each has its ruses of war, its methods of attack, its methods of killing."
What tactics--"studied, scientific, worthy of the athletes of the ancient palaestra"--are those which the Sphex employs to paralyse the Cricket and the Cerceris to capture the Cleona, to secure them in a suitable place, so as to operate on them more surely and at leisure!
Beside these master paralysers, so expert in the art of dealing slow death, there are those which, with a precision no less scholarly, kill and wither their victims at a single stroke, and without leaving a trace: "true practitioners in crime."
On the rock-rose bushes, with their great pink flowers, "the pretty Thomisus, the little crab-spider, clad in satin," watches for the domestic bee, and suddenly kills it, seizing the back of the head, while the Philanthus, also seizing it by the head, plunges its sting under the chin, neither too high nor too low, but "exactly in the narrow joint of the neck," for both insects know that in this limited spot, in which is concentrated a small nervous mass, something like a brain, is "the weak point, most vulnerable of all," the fault in the cuirass, the vital centre. Others, like the Araneidae, intoxicate their prey, and their subtle bite, "which resembles a kiss," in whatever part of the body it is applied, "produces almost immediately a gradual swoon."
Thus the great hairy Bourdon, in the course of its peregrinations across the wastes of thyme, sometimes foolishly strays into the lair of the Tarantula, whose eyes glimmer like jewels at the back of his den. Hardly has the insect disappeared underground than a sort of shrill rattling is heard, a "true death-song," immediately followed by the completest silence. "Only a moment, and the unfortunate creature is absolutely dead, proboscis outstretched and limbs relaxed. The bite of the rattlesnake would not produce a more sudden paralysis."