User blog comment:Lord Loss/Monster Appreciation Day: Ukanlos/@comment-15258026-20140316131211/@comment-26074976-20140319133452

It's because of the monster it evolved from. It used to be a species that flew but over millions of years it's wings have degenerated (shrunk) as it didn't need them. It *was* a flying Wyvern but no longer flies. The reason it's in that class is because it's related to flying species. The fact it stays in one area doesn't mean it isn't a flying Wyvern. It's like saying Bracchydios has well evolved arms and other brute wyverns don't. So it can't be a brute Wyvern.