I put permethrin on the straps and hammock once a year. Takes care of the bugs. Other critters haven't bothered me, though there were some really loud arguing coons that went through my site once, and I also heard something (probably a bear) tearing into a log nearby. I've read about people having deer or other critters bumping their hammock or tarp, but not anything that did more than that.

I tend to prefer my gear hanging with me - critters who like to lick salt from pack straps will get a shout if they bump me.