Not, you're right. A wyvern's wings double as their front legs. A dragon has 4 legs and wings.
Right? That's why when I watched Harry Potter, they call the creatures there as Dragons, instead of Wyverns. While here, it's vice versa.
Same thing in Skyrim. The dragons of Skyrim are actually wyvern. Some people will say that wyvern's are a type of dragon, but when you take a good look at mythology, they are not dragons just closely related. Like how hyenas are closely related to felines but are not actually cats.
Yep. That too.
Uh... That's not a wyvern. As far as I know, wyverns have wing and only two legs in the back (therefore, their wings serve as their hands). But correct me if I'm wrong though.