 The Titans are giant humanoid figures about 3 – 15 meters (10 – 50 ft) tall and are usually masculine in body structure but lack reproductive organs. Although they do not appear to need food, they instinctively attack and eat humans on sight; it is mentioned that they derive their energy from sunlight. In addition the Titans also do not have a proper digestive tract; once they have eaten their fill of human prey, titans will vomit their meal into large, slimy balls, derisively referred to as "hairballs". Finally, their skin is tough and difficult to penetrate, and they regenerate quickly from injuries, save for a weak spot at the nape of their neck.
