When did Giant Mammals Live on the Earth?

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The largest land mammal of all time was the giant hornless rhinoceros Indricotherium, which lived in the Oligocene epoch. It stood 5.5 metres high at the shoulder and its head would bypass a modern giraffe. Brontotheres stood at 2.5 metres at the shoulder. The horse like animal Moropus was a little smaller. All these animals browsed in the open plains.

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