A cave lion cub discovered in Russia is 43,000-years-old and could be the most well-preserved animal from that time period to ever be discovered.
The cub was only a month old when it died all those years ago.
Researchers named the cub Boris, and say it's unique because its skin, skeleton, wool and organs are all well preserved.
The researchers are also hoping to find some of the cubs' mothers' milk to better understand their diet.
There was also another cub found in Russia named Sparta.
As the Russian permafrost continues to melt, more of the past animals are being revealed.