The Clan of the Cave Bear series by Jean M Auel is so good. It's informative and the story of Ayla's life takes you through so many emotions. There's love and heart break and survival against the all odds.
6W. Panthera (Leo) spelaea, the cave lion, is the one in the middle; males did not have manes. (If you want to make your head hurt, dive into the discussion boards about relative sizes of various felines, past and present.) -- In "Clan...." we meet the cave lion early on and his presence is felt throughout, as he comes to symbolize Ayla in the way the cave bear does for the clan.
Fossil Cave Bear Fang - Ursus spelaeus - 4" (10 cm) long - This species of cave bear lived in Europe during the Pleistocene : 2.6 million - 11,700 years ago, however, this species was extinct about 27,500 years ago - Romania