Several months later the Beagle arrived in Brazil, and now Darwin understood why he had wanted so badly to go on this voyage. He was completely mesmerized by the intense variety of the vegetation and wildlife—this was a naturalist’s paradise. It was not like anything he had observed or collected in England. One day on a walk through a forest, he stood to the side and witnessed the most bizarre and cruel spectacle he had ever seen: a march of tiny black ants, their columns over a hundred yards long, devouring every living thing in their path. Everywhere he turned he saw some example of the
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