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The Tyrannosauras Rex lived between 85 and 65 million years ago. They lived in a time known as the Mesozoic era .The fossil for this animal was found in 1902 and was named the T.rex in 1905 by Henry Osborn
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Wooly Mammonths lived from the Pleistocene to the early Holocene epoch. They were alive 120,000 to 4,000 years ago. The Wooly Mammonth fossil was found in 1796.
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The Sabertooth Tiger was endemic to North And South America. This animal existed 10,000 years ago and lived during the Pleistocene epoch.