Dragon vs Wyvern

[Hagrid]

Hi, I've posted in Grownups, but 1st time here. Posting about the 
Dragons we have seen so far.

In the SS/PS, Norbert, the Norwegian Ridgeback Dragon, is born with 
hind legs and hands poking out of his wings, like a bat.

In COS, Lockhart has a skeleton dangling from the ceiling. It seems 
to be a Dragon with hind legs and wings ... 

But Dragons are ment to have 4 legs. It is the Wyvern that has 2 
legs. (My school was called "Wyvern" after the family crest of the 
Methoidist founder, John Wesley. So the school embllem was a Wyvern, 
while the 3rd grade teacher was a dragon)

Just a thought that this could be an error

aussie