Packrats help dig up the past

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Packrats help dig up the past

Nests hold clues about the climate
In 1979, Julio Betancourt holds a midden he collected from a cliff in New Mexico’s Chaco Canyon.

Packrats help dig up the past

In 1979, Julio Betancourt holds a midden he collected from a cliff in New Mexico’s Chaco Canyon.
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