Habitat doesn’t replicate itself. Places get crowded. Creatures go hungry. They struggle. The result is competition and deprivation and misery, winners and losers, unsuccessful efforts to breed and, for the less fortunate individuals, early death. Many are called, but few are chosen. The book that awakened Darwin to this reality was An Essay on the Principle of Population, by a severely logical clergyman and scholar named Thomas Malthus.
-David Quammen
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