Researchers at the University of Michigan believe that both of the 40,000-year-old babies, nicknamed Lyuba and Khroma, suffocated in mud -- Lyuba after falling through lake ice, Khroma after tumbling into a river. Through a dental analysis on both Ice Age animals, researchers also learned that Lyuba was likely one month old when she died. Khroma was about two months old.
(Story continues below.) A photograph of Lyuba’s external appearance prior to any internal examination.