The pressure of growth among animals is a kind of terrible hunger. These billions must eat in order to fuel their surge to sexual maturity so that they may pump out more billions of eggs. And what are the fish on the bed going to eat, or hatched mantises in a Mason jar going to eat, but each other? There is a terrible innocence in the benumbed world of the lower animals, reducing life there to a universal chomp. Edwin Way Teale, in The Strange Lives of Familiar Insects—a book I couldn't live without—describes several occasions of meals mouthed under the pressure of a hunger that knew no bounds.
There is the dragonfly nymph, for instance, which stalks the bottom of the creek and the pond in search of live prey to snare with its hooked, unfolding lip. Dragonfly nymphs are insatiable and mighty. They clasp and devour whole minnows and fat tadpoles. "A dragonfly nymph," says Teale, "has even been seen climbing up out of the water on a plant to attack a helpless dragonfly emerging, soft and rumpled, from its nymphal skin." Is this where I draw the line?
It is between mothers and their offspring that these feedings have truly macabre overtones. Look at lacewings. Lacewings are those fragile green creatures with large, transparent wings. The larvae eat enormous numbers of aphids, the adults mate in a fluttering rush of instinct, lay eggs, and die by the millions in the first cold snap of fall. Sometimes, when a female lays her fertile eggs on a green leaf atop a slender stalked thread, she is hungry. She pauses in her laying, turns around, and eats her eggs one by one, then lays some more, and eats them, too.
Anything can happen, and anything does; what's it all about? Valerie Eliot, T. S. Eliot's widow, wrote in a letter to the London Times: "My husband, T. S. Eliot, loved to recount how late one evening he stopped a taxi. As he got in the driver said: 'You're T. S. Eliot.' When asked how he knew, he replied: 'Ah, I've got an eye for a celebrity. Only the other evening I picked up Bertrand Russell, and I said to him, "Well, Lord Russell, what's it all about," and, do you know, he couldn't tell me.'" Well, Lord God, asks the delicate, dying lacewing whose mandibles are wet with the juice secreted by her own ovipositor, what's it all about? ("And, do you know...")
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Although mothers devouring their own offspring is patently the more senseless, somehow the reverse behavior is the more appalling. In the death of the parent in the jaws of its offspring I recognize a universal drama that chance occurrence has merely telescoped, so that I can see all the players at once. Gall gnats, for instance, are common small flies. Sometimes, according to Teale, a gall gnat larva, which does not resemble the adult in the least, and has certainly not mated, nevertheless produces within its body eggs, live eggs, which then hatch within its soft tissues. Sometimes the eggs hatch alive even within the quiescent body of the pupa. The same incredible thing occasionally occurs within the genus Miastor, again to both larvae and pupae. "These eggs hatch within their bodies and the ravenous larvae which emerge immediately begin devouring their parents." In this case, I know what it's all about, and I wish I didn't. The parents die, the next generation lives, ad majorem gloriam, and so it goes.