From publisher blurb:
A Playable Race of Turtles (Mutant, Ninja, and Otherwise)
Play a slow and steady tortoise, a fast-swimming terapin, or a surprisingly-nimble turtle mutant who sneaks about in shadows. Animal Races: Clan of the Turtle provides custmizable racial traits and feats for a new race of anthropomorphic turtles, including rules for enchanting one's shell as magic armor and gaining early access to thematically appropriate prestige class levels.
Also included: an overview of Turtle Clan culture, the forces that have driven Turtle Clan mutants into hiding, and the many adversaries that heroes of the Turtle Clans may face. Suit up in your heraldic colors, stare down the minions of the mysterious Dark Warrior, and rise up against injustice in ways only a Turtle can!