Is it ever stated exactly how big they are? In my head they look like super mutants from the Fallout series, but more human looking. And purple, for some reason. The regular zombies look more like rabid wolves running on all fours to me. I'm not sure why but when you hear them running it doesn't sound like they are on two feet. And their howls too, everything about them (in terms of the audio) sounds so animalistic.

I am curious what everyone elses mental pictures of them are though. Can you describe it? Or is it just in your head and you can't put it into words? I think, for me at least, that is part of the magic of WA.