 As a supernatural figure, the yahui appears in Postclassic Mixtec codices as an entity wearing a serpent or reptilian tail and headdress (similar to the "xiuhcoatl" motif) and the carapace of a turtle.Depictions of yahui-figures appear in several Mixtec codices, including the Codex Zouche-Nuttall, Codex Vindobonensis Mexicanus I, Codex Selden, Codex Bodley, Codex Egerton, and Codex Becker I/II.The yahui appears in two main forms