Owen the Hippo and Mzee the Tortoise is a heartwarming story of an unlikely friendship between two animals from different species. When Owen, a baby hippo, is separated from his family during a tsunami, he is taken in by Mzee
From Wikipedia
Owen and Mzee are a hippopotamus and an Aldabra giant tortoise duo, respectively, that attracted media attention after forming an unusual bond of friendship. They live in Haller Park, Bamburi, Kenya.