What's a Zoan? Also... there's more than just tribes like that, there are 5 well known Laguz Kingdoms. The beast kingdom of Galia, the dragon Kingdom of Goldoa, the hawk kingdom of Phonicis, the crow kingdom of Kilvas, and the herons of Serenes. Recently we also learned of another kingdom across the great desert, the kingdom of Hatori, where queen Nailah and the wolf tribe originate from.

... What do you mean by just in songs?