"I recommend you ask me everything in your head, if that dragon hears you he might rip you apart like that werewolf. They tend to get aggressive because of their weak genes. The chance to grow wings as a Black Dragon is low. If we were to use percentage, then I would say that one out of ten thousand will have a chance to be born with wings. Even then, it is a chance. That means even one in twenty thousand or thirty thousand will have that chance. The chance is there, but whether it produces a winged Black Dragon or not is not certain," Nero broadened Jacq's knowledge about the Black Dragons after seeing his interest in them.
