The Butterfly Lion by Morpurgo Michael

ILLUSTRATED BY CHRISTIAN BIRMINGHAM. A lyrical and moving tale of a young boy growing up in Africa, and his lifelong friendship with a white lion. "All my life I'll think of you, I promise I will. I won't ever forget you." Bertie rescues an orphaned white lion cub from the African veld. They are inseparable until Bertie is sent to boarding school far away in England and the lion is sold to a circus. Bertie swears that one day they will see one another again, but it is the butterfly lion which ensures that their friendship will never be forgotten.