User blog comment:Theangelandthehunter/Pages/@comment-7971816-20140427114254/@comment-4984687-20140427200226

The river snake wasn't completely seen, so it could just be an already existing animal that traveled to North America after the Apocalypse. The fog isn't considered a mutation either, and not much is known about it at this point so we just have to see what causes it.

On Wikipedia, this would normally happen. Since this is a wiki made specifically for the show, it's safe to say you can make seperate pages for all of these so there's no need for merging. Some of the pages themselves might even be expanded on.