The ones I've seen around my place haven't rattled when I was close. The way I knew they were there was a rustling noise they made when they moved suddenly when I got close. Here is one I saw a couple of weekends ago when I was working on an overhang for my equipment shed. It was about 30 in. long & about twice as big around as a broom stick. I just ignored it & it disappeared not too long after we inspected each other.
