1 worm came from an ancient squirrel burrow in a permafrost wall of the Duvanny Yar outcrop in the lower reaches of the Kolyma River – close to the site of Pleistocene Park which is seeking to recreate the Arctic habitat of the extinct woolly mammoth. This is around 32 ka old. Another was found in permafrost near Alazeya River in 2015, and is around 42 ka old.

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