Earlier research by other groups had shown that the rotifers could survive up to 10 years when frozen. In a new study, the Russian researchers used radiocarbon dating to determine that the critters they recovered from the permafrost — ground that is frozen year-round, apart from a thin layer near the surface — were about 24,000 years old.
The study was published in the journal Current Biology on Monday. It’s not the first time ancient life has been resurrected from a permanently frozen habitat.
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