Wyvern

This was mean to be a dragon, actually, but a 13 year-old boy pointed out to me that this quick scribble more closely resembled a wyvern, so I guess that's what it is. Please let me know if you have any idea what the difference is.

(*Update* I just googled it, and apparently the difference is the number of legs: dragon=4, wyvern=2. So there you go, I hope we've all learned something today.)