How do we distinguish a dragon, a wyrm and a wyvern in terms of the . . . Regarding the term Wyvern At the origin, wyverns, aka Guivre, Vouivre or Vipera, are creatures with ears like horns described by Pliny whose reproductive behaviors is that the female is eating the head of its male when mating During the middle age that creature will gain most of the features of the dragon as shown here:
Newest dragons Questions - Mythology Folklore Stack Exchange How do we distinguish a dragon, a wyrm and a wyvern in terms of the number of legs? As I have seen lots of interest around this answer, more precisely around the number of legs (as @lfurini said), I have decided to open a question to find a canonical answer From the discussion (