"They were stealthy hunters, crack shots, and experienced survivalists, and, given the right tools, they believed that they would never find themselves in a situation in the wild that they could not control. But as they struggled to make their way along the shores of the River of Doubt, any basis for such confidence was quickly slipping away. Compared with the creatures of the Amazon, including the Indians whose territory they were invading, they were all - from the lowliest camarada to the former president of the United States - clumsy, conspicuous prey."