Thanks for the info. I hate to use some of the super toxic stuff out there, am going to try the boric acid. Does that come in powder/granule form or is it liquid (also need to find out if I can get it here in SP, if anyone knows please let me know)? We have all kinds of geckos, wishwillys, etc. along with birds on the lot so I want something that hopefully will minimize the risk to them (if possible). I know pouring boiling water down their mounds works well, but we aren't living there yet, so that isn't a option.