During the Cenozoic era animals grew to great sizes and proportions. The wooly mammoth and the saber tooth tiger were much larger than animals we see today. Some of the causes for their extinction may be

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Dwindling food supplies and extreme climatic variations likely played a role in the extinction of large animals during the Cenozoic era. The emergence of man and competition for food may have also had an impact, but this alone does not fully explain the extinction of these animals. The burning of grasslands and the extensive ice sheets were more relevant to earlier periods of Earth's history and would not have had a direct impact on Cenozoic animals.

During the Cenozoic Era Animals Grew to Great Sizes and Proportions