Like a number of prehistoric reptiles, Pteranodon was not a dinosaur, but a close cousin. These pterosaurs had wingspans of some 20 feet, but they weighed less than 65 pounds. Pteranodon is famous for it's large crest. Some of these crests are over 3 feet long! Pteranodon is probably the most famous pterosaur yet. These reptiles lived 80 million years ago in North America, Europe, and Asia.