'Genetic Fossils' Change Extinction Picture Woolly mammoths and ancient horses may have been roaming the North American steppes longer than scientists thought. Evolutionary biologist Eske Willerslev describes how his team used DNA samples taken from permafrost cores to recalculate when the animals may have disappeared.
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'Genetic Fossils' Change Extinction Picture

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'Genetic Fossils' Change Extinction Picture

'Genetic Fossils' Change Extinction Picture

'Genetic Fossils' Change Extinction Picture

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  • <iframe src="https://www.npr.org/player/embed/121615598/121615585" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

Woolly mammoths and ancient horses may have been roaming the North American steppes longer than scientists thought. Evolutionary biologist Eske Willerslev describes how his team used DNA samples taken from permafrost cores to recalculate when the animals may have disappeared. More information.