In literature, there are many personified lions who do many human activities such as letter writing, King Leonidas of Naboombu and the Cowardly Lion of Oz, are good examples. Also in literature, warriors and brave men, can be referred as 'lions'. ie ' the lion drew up his sword'. Women who are protective of children, can be referred to as 'she was like a lioness protecting her sons'. So this is a very sensible sentence in the right context.