I played Skyrim and have impression that some types of mobs have some freedom on travelling. May be it was only impression because they were rabbits and foxes that nobody usually pay too much attention. Bears usually occupied one place only.
But actually why not plan long paths for bears and all other creatures - Why in MMOs do expect them in one place running on 2 sq meters? Why not see how they fight together when meet and have real random wilderness world?
How is it done in ESO (just to keep forum subject)? I know this NDA stuff, but on some videos I (unfortunately) seen dumb mobs waiting silently for heroes - I know it is may be easier to sneak to resting mob, but if they could just move then sneaking would be much more challenging. Also finding mobs would not be static task - it would be more like hunting.