Little cat is possible brother to ‘Boris’ found last year some 15 metres (50ft) away.
Angelina Sadovnikova, then 11, came across the mummified Pleistocene rodent in a cavity left by woolly mammoth tusk diggers.
Samples taken from cubs frozen in permafrost for at least 12,000 years.
Examination of ancient cave lion cub offers prospect of 'oldest-ever breast milk'.
Tantalising studies now underway to establish if one of two carcases preserved by permafrost has traces of world's oldest mother's milk.
Unveiled: two extinct cave lions - dug from the permafrost - make their first appearance since Pleistocene times.
'Sensational' find of two cubs, the best preserved ever seen in the world, announced today.
Remarkable images show a test tube blood sample from a female of the long-extinct species.