They went extinct more than 120,000 years ago, when global temperatures rise for a while. Decreased by the amount of several million. And only a few tens of thousands. But the number has increased after the world into another ice age , researchers have found. Reduced the lead to the extinction of that. Began around 20,000 years ago, when the ice was at its peak. From the understanding that when the world began 14,000 years ago, when temperatures rise again. The researchers estimated that Too Cold Weather The grass is their food shortages. Such condition continues to be, even the ice age ended. This is possible The grasslands are used as a source of livelihood for them. Replaced by forests in the south. Grasslands and tundra in the north.
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