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Although it is sometimes thought to be a new phenomenon, overexploitation has many examples in human history. A. Strong evidence for overexploitation comes from the extinction of many species of flightless birds on Pacific islands after these places were colonized by humans. B. The fact that only flightless-bird species became extinct on Pacific islands after the arrival of humans could indicate that overexploitation of forest habitats rather than hunting caused the massive overkill. C. Presently, overexploitation may be worst in the sea, where global overfishing has significantly reduced some predatory-fish population. D. Although some people attribute the mass extinctions of large animals at the end of the Pleistocene epoch to climate change, many scientists believe them to result from overexploitation by humans. E. Because of their comparative diversity, marine species are less susceptible to the overexploitation that has affected mammals and birds on land. F. The fact that most small-rodent species died out during the Pleistocene epoch provides evidence that humans were responsible for the mass extinction of animals during this period.