The ancient cubs, called Uyan and Dina, the best-preserved ever seen of this long-gone species, are a 'sensational' find, according to scientists who normally choose their adjectives with studied caution.
Today in Yakutsk, the coldest city on Earth, the pre-historic specimens were revealed to the media in a permafrost cave, perhaps reminiscent of their natural habitat when they roamed Siberia.
They were displayed on giant slabs of ice, the size of plump domestic cats. The permafrost preserved them in wondrous lifelike detail for at least 12,000 years but they could be even more ancient: only now will tests commence to establish their true age.
The cubs were found in Abyisky district, on the bank of the Uyandina River,' said Dr Albert Protopopov, head of the mammoth fauna studies department of the Yakutian Academy of Sciences.
There was a summer rise in the river level, and when the water subsided there were landslides and cracks. Worker Yakov Androsov said: 'In one crack, we saw an ice lens with some pieces inside. We decided to take a closer look and found the cubs.'
The river is just below the Arctic Circle, some 1,045 kilometres north east of regional capital Yakutsk. 'This find, beyond any doubt, is sensational,' said Protopopov. The cubs 'are complete with all their body parts: fur, ears, soft tissue and even whiskers'. They are, he claimed, unique in the world, the most complete remains of cave lions ever found.
Might it be possible to clone the cave lions? The scientists were not ready to discuss the issue, although there are plans to use DNA found in remains of ancient, extinct woolly mammoths in the same region to bring the beasts back to life. 'I would not talk about cloning now. Our main task here is to decipher the genome and to work with it. I think that speculation about cloning is very premature.'