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#paleogene fauna #basilosaurus #hyracotherium #early primates #eocene epoch #oligocene epoch #paleogene environment

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#oligocene epoch #global cooling #mesohippus #grassland expansion #cenozoic era #paleogene period

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#paraceratherium #giant mammal #extinct animal #hornless rhino relative #cenozoic era #oligocene epoch #prehistoric giant

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#indricotherium #paraceratherium #largest land mammal #giant herbivore #megafauna #extinct rhino relative #oligocene epoch #size comparison