I found the description of this mod good but when I looked the video, I became convinced it is not realistic : apart from the Mammoth which is good (the original sound lacked bass), all other animals become stealthy ninja animals. Small animals running do make sound (even rabbits), especially when fleeing from a human or other predator because stealth is not their main concern at that time. And the video is even less realistic when it comes to horkers : you nearly can't hear it, when the thing must weigh more than a ton. The spider : well, let's say that I have no idea whether a 300 kilos spider would make sound or not (because of the eight legs horror), though I doubt it could run without a sound like here. I'm really not convinced but maybe the in-game feeling is different (edit : indeed, I did not remember I had it installed in STEP ; I suppose, it becomes lost in game, among all the rest but the rest of my rant remains).