There are three categories of Devil Fruits;[19] Paramecia - is a category of fruits that gives the user various superhuman abilities, such as Luffy's rubber physiology, Nico Robin's appendage generation, or Brook's self-revival. Zoan - fruits allow the user to fully or partially transform into a specific animal, like how Tony Tony Chopper can transform into a human-reindeer hybrid. Certain Zoan fruits allow the user to transform into prehistoric creatures, like X Drake being able to turn into an Allosaurus, and even mythical creatures, like how Marco can transform into a phoenix. Through an unknown technique developed by scientist Dr. Vegapunk, inanimate objects can also "eat" a Devil Fruit and gain sentience, like how Spandam's sword becomes an elephant. Logia - fruits give control over and allow the user "to change their living body structure into the powers of nature", like Smoker's control over smoke, Portgas D. Ace's control over fire, and Sir Crocodile's control over-sand.