The difference between the methods of a carnivore and a parasite is simply the difference between living upon capital and upon income; between the habits of the beaver, which cuts down a whole tree a hundred years old, and the bark-beetle, which levies a daily toll from the tissues of the tree; between the burglar and the blackmailer.

Animal Ecology, Chapter VI (pp. 72-73), Sidgwick & Jackson, Ltd. 1927