![]() Chapter Five reviews the extinction of the graptolites, caused by changes in ocean chemistry as well as by rising sea levels and temperatures. ![]() Kolbert compares the effects of this natural event with the impact currently seen on the planet due to deforestation and industrialization. The great auk featured in Chapter Three went extinct entirely because of man: hunted for its meat and feathers, it stood no chance of surviving when humans hunted it during mating season, when it was most vulnerable.Ĭhapter Four features the ammonites, survivors of the great meteor event that caused the extinction of many species at the end of the Cretaceous Period. Chapter Two focuses on the American mastodon, a large, ancient mammal that went extinct because of a combination of human activities and a massive extinction event. ![]() In this example, Kolbert immediately makes clear to the reader the dangers associated with invasive species. Once a robust species, these frogs are dying because of an invasive fungus introduced by humans to their ecosystem. In the first chapter, she goes to Panama to examine the nearly extinct golden frog. ![]() ![]() In thirteen chapters, each of which focuses on different proofs of a modern extinction event, Kolbert visits and speaks with experts on a series of ecosystems and organisms from both the past and present. ![]()
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