Ancient Zoans are a fictional group of creatures from the One Piece universe, known for their ability to transform into various animal forms. These transformations grant them enhanced physical abilities and unique traits, making them formidable opponents. The term "Zoan" refers to a specific type of Devil Fruit that allows users to shift between human and animal states. These creatures are categorized into three main types: standard Zoans, which transform into real animals; Ancient Zoans, which allow users to become extinct creatures like dinosaurs; and Mythical Zoans, which grant powers of legendary beings. Ancient Zoans are particularly valued for their strength and rarity in the One Piece world.