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Welcome The Cenozoic era began about 65 million years ago and continues into the present. The Cenozoic era is also known as the Age of Mammals because the extinction of many groups of giant mammals, allowing smaller species to thrive and diversify because their predators no longer existed. Due to the large span of time covered by the period, it is beneficial to discuss the animal population by the milestone of the era rather than in generalities. #ExtinctAnimals #SizeComparison #mammoth #BiggestAnimal #animals #animalsizecomparison #prehistoricanimals Subscribe for more comparison videos.
