The Narnian sun is a flaming disc that revolves around the world once daily. The sun has its own ecosystem, and is thought to be inhabited by great white birds, which appear in "The Voyage of the Dawn Treader". Some of the vegetation on the sun is known to contain healing properties. For example, the extract of a fire-flower found in the mountains can heal any wound or sickness, and a fire-berry that grows in its valleys, when eaten by the fallen star Ramandu, works to reverse the effects of age.