Twenty thousand years ago, it was a lousy time to be a woolly mammoth. As the last ice age advanced, the grass they liked to eat became buried under layers of snow. But one plentiful source of nutrients was easily accessible to mammoths—their own dung...
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Twenty thousand years ago, it was a lousy time to be a woolly mammoth. As the last ice age advanced, the grass they liked to eat became buried under layers of snow. But one plentiful source of nutrients was easily accessible to mammoths—their own dung...
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