New photographs of a pair of cave lion cubs found frozen in Siberia give an unprecedented look at a species that has been extinct for about 10,000 years.

Russian researchers revealed new details about the cubs in a press conference on Tuesday, including how they were found, and how they died.  (See "Frozen Cave Lion Cubs from the Ice Age Found in Siberia.")

Collectors unearthed the cave lions while looking for mammoth tusks in Yakutia, Siberia, and at first were not sure what they had found. They placed the cubs in a glacier to keep them frozen, and then sent them to scientists in Yakutsk for analysis.

Nicknamed Uyan and Dina for the Uyandina River where they were found, the kittens will