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Ancient burrows

A four-legged, mammal-like reptile dug a lair in the Antarctic soil between 280 and 235 million years ago

Triassic-era sediments reveal that a four-legged animal — a reptile of the type from which modern-day mammals evolved — once burrowed in Antarctic soils. The findings, reported in the June Journal of Vertebrate Paleontology, are the first to show that such a creature lived so close to the poles during that time period.

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