A Bennu is a type of creature with orange-blue fire-resistant feathers and small, watery eyes, first mentioned in Everblaze. Bennus have stork-like bodies with pelican-like beaks. Their tears have medicinal properties. Bennus often construct their nests near either Flareadons or areas where lightning strikes are a regular occurrence.
In Book 3: Everblaze, Sophie was given specially designed suits made of Flareadon fur and Bennu feathers for Fintan's healing for protection against fire.