The ancient creatures are now the oldest living animals on the planet, scientists say.
After being found frozen in the Arctic permafrost for 42,000 years, the two nematodes – or roundworms – are now moving and eating again, for the first time in thousands of years.
A team of Russian scientists working with Princeton University defrosted over 300 prehistoric worms in what’s been described as a major scientific breakthrough.
Two of the females have “showed signs of life”, the team said.
“Our data demonstrates the ability of multicellular organisms to survive long-term (tens of thousands of years) cryobiosis under conditions of natural cryoconservation,” they said.
They hope the prehistoric worms will be able to help in the future with work in biology, medicine and astronomy.
Both worms were found in the coldest region of Russia, Yakutia.
The previous oldest living creature was thought to be an ancient living shark born in the 1500s.
“Two females showed signs of life”
The breakthrough also gives hope to fans of cryonics who want to be frozen and brought back to life in the future.
In January, Daily Star Online reported the first person to be cryonically frozen could be brought back to life in just 10 years.
President of the US Cryonics Institute Dennis Kowalski said cryogenics offers humans a real-life fountain of youth.
While celebs including Simon Cowell and Britney Spears have reportedly signed up to be frozen when they die.