This is a story of a scarcely credible abundance, of flocks of birds so vast they made the sky invisible. It is also a story, almost as difficult to credit, of a collapse into extinction so startling to the inhabitants of the New World as to provoke a mystery. In the fate of the North American passenger pigeon we can read much of the story of wild America - the astonishment that accompanied its discovery, the allure of its natural 'productions', the ruthless exploitation of its 'commodities' and the ultimate betrayal of its peculiar genius. And in the bird's fate can be read, too, the essential vulnerability of species, the unpredictable passage of life itself.