"Those, my dear Syntax, are also parasites."
"What, parasites living on parasites?"
The Tadpole's last Stage.
"Why not? Nature is economical. Don't you live on beef, and mutton, and fish? Don't these beeves, muttons, and fishes live on vegetables and animals? Don't the vegetables and animals live on other organic matters? Eat and be eaten, is one law: live and let live, is another."
The learned Doctor remained thoughtful; then he screwed up one side of his face into the most frightful wrinkles, while with the eye of the other he resumed his examination of the Vorticella.
—George Henry Lewes.