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COLD DIGGER
The burrows unearthed in the Transantarctic mountains could have been carved by the Thrinaxodon, a cat-sized, whiskered reptile. Other research had unearthed a fossilized Thrinaxodon curled up in a very similar burrow in the Karoo Basin of South Africa. Credit: C. Sidor, M. Miller, J. Isbell

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