Pteranodons were flying reptiles (pterosaurs) that were about 6 feet (1.8 m) long, had a 25-33 foot (7.8-10 m) wingspread, and weighed about 35 pounds; its standing height was about 6 feet (1.8 m). This wing-span is longer than any known bird. Pteranodons had hollow bones, were lightly built, had almost no tail, and small bodies; they may have had fur. They had large brains and good eyesight. Some pteranodons had long, light-weight, bony crests on their heads that may have acted as a rudder or stabilizer when flying, or may have been a sexual characteristic. They had no teeth-enchanted learning